Update internal use of decimal to float (#10333)

# Description
We made the decision that our floating point type should be referred to
as `float` over `decimal`.
Commands were updated by #9979 and #10320

Now make the internal codebase consistent in referring to this data type
as `float`.

Work for #10332

# User-Facing Changes

`decimal` has been removed as a type name/symbol. 

Instead of 
```nushell
def foo [bar: decimal] decimal -> decimal {}
```
use 
```nushell
def foo [bar: float] float -> float {}
```

Potential effect of `SyntaxShape`'s `Display` implementation now also
referring to `float` instead of `decimal`

# Details
- Rename `SyntaxShape::Decimal` to `Float`
- Update `Display for SyntaxShape` to `float`
- Update error message + fn name in dataframe code
- Fix docs in command examples
- Rename tests that are float specific
- Update doccomment on `SyntaxShape`
- Update comment in script

# Tests + Formatting
Updates the names of some tests

crates/nu-cmd-dataframe/src/dataframe/values/nu_dataframe/between_values.rs

@@ -226,7 +226,7 @@ pub(super) fn compute_series_single_value(
                 compute_series_i64(&lhs, *val, <ChunkedArray<Int64Type>>::add, lhs_span)
             }
             Value::Float { val, .. } => {
-                compute_series_decimal(&lhs, *val, <ChunkedArray<Float64Type>>::add, lhs_span)
+                compute_series_float(&lhs, *val, <ChunkedArray<Float64Type>>::add, lhs_span)
             }
             Value::String { val, .. } => add_string_to_series(&lhs, val, lhs_span),
             _ => Err(ShellError::OperatorMismatch {
@@ -242,7 +242,7 @@ pub(super) fn compute_series_single_value(
                 compute_series_i64(&lhs, *val, <ChunkedArray<Int64Type>>::sub, lhs_span)
             }
             Value::Float { val, .. } => {
-                compute_series_decimal(&lhs, *val, <ChunkedArray<Float64Type>>::sub, lhs_span)
+                compute_series_float(&lhs, *val, <ChunkedArray<Float64Type>>::sub, lhs_span)
             }
             _ => Err(ShellError::OperatorMismatch {
                 op_span: operator.span,
@@ -257,7 +257,7 @@ pub(super) fn compute_series_single_value(
                 compute_series_i64(&lhs, *val, <ChunkedArray<Int64Type>>::mul, lhs_span)
             }
             Value::Float { val, .. } => {
-                compute_series_decimal(&lhs, *val, <ChunkedArray<Float64Type>>::mul, lhs_span)
+                compute_series_float(&lhs, *val, <ChunkedArray<Float64Type>>::mul, lhs_span)
             }
             _ => Err(ShellError::OperatorMismatch {
                 op_span: operator.span,
@@ -281,12 +281,7 @@ pub(super) fn compute_series_single_value(
                     if val.is_zero() {
                         Err(ShellError::DivisionByZero { span })
                     } else {
-                        compute_series_decimal(
-                            &lhs,
-                            *val,
-                            <ChunkedArray<Float64Type>>::div,
-                            lhs_span,
-                        )
+                        compute_series_float(&lhs, *val, <ChunkedArray<Float64Type>>::div, lhs_span)
                     }
                 }
                 _ => Err(ShellError::OperatorMismatch {
@@ -301,7 +296,7 @@ pub(super) fn compute_series_single_value(
         Operator::Comparison(Comparison::Equal) => match &right {
             Value::Int { val, .. } => compare_series_i64(&lhs, *val, ChunkedArray::equal, lhs_span),
             Value::Float { val, .. } => {
-                compare_series_decimal(&lhs, *val, ChunkedArray::equal, lhs_span)
+                compare_series_float(&lhs, *val, ChunkedArray::equal, lhs_span)
             }
             Value::String { val, .. } => {
                 let equal_pattern = format!("^{}$", fancy_regex::escape(val));
@@ -323,7 +318,7 @@ pub(super) fn compute_series_single_value(
                 compare_series_i64(&lhs, *val, ChunkedArray::not_equal, lhs_span)
             }
             Value::Float { val, .. } => {
-                compare_series_decimal(&lhs, *val, ChunkedArray::not_equal, lhs_span)
+                compare_series_float(&lhs, *val, ChunkedArray::not_equal, lhs_span)
             }
             Value::Date { val, .. } => compare_series_i64(
                 &lhs,
@@ -342,7 +337,7 @@ pub(super) fn compute_series_single_value(
         Operator::Comparison(Comparison::LessThan) => match &right {
             Value::Int { val, .. } => compare_series_i64(&lhs, *val, ChunkedArray::lt, lhs_span),
             Value::Float { val, .. } => {
-                compare_series_decimal(&lhs, *val, ChunkedArray::lt, lhs_span)
+                compare_series_float(&lhs, *val, ChunkedArray::lt, lhs_span)
             }
             Value::Date { val, .. } => {
                 compare_series_i64(&lhs, val.timestamp_millis(), ChunkedArray::lt, lhs_span)
@@ -358,7 +353,7 @@ pub(super) fn compute_series_single_value(
         Operator::Comparison(Comparison::LessThanOrEqual) => match &right {
             Value::Int { val, .. } => compare_series_i64(&lhs, *val, ChunkedArray::lt_eq, lhs_span),
             Value::Float { val, .. } => {
-                compare_series_decimal(&lhs, *val, ChunkedArray::lt_eq, lhs_span)
+                compare_series_float(&lhs, *val, ChunkedArray::lt_eq, lhs_span)
             }
             Value::Date { val, .. } => {
                 compare_series_i64(&lhs, val.timestamp_millis(), ChunkedArray::lt_eq, lhs_span)
@@ -374,7 +369,7 @@ pub(super) fn compute_series_single_value(
         Operator::Comparison(Comparison::GreaterThan) => match &right {
             Value::Int { val, .. } => compare_series_i64(&lhs, *val, ChunkedArray::gt, lhs_span),
             Value::Float { val, .. } => {
-                compare_series_decimal(&lhs, *val, ChunkedArray::gt, lhs_span)
+                compare_series_float(&lhs, *val, ChunkedArray::gt, lhs_span)
             }
             Value::Date { val, .. } => {
                 compare_series_i64(&lhs, val.timestamp_millis(), ChunkedArray::gt, lhs_span)
@@ -390,7 +385,7 @@ pub(super) fn compute_series_single_value(
         Operator::Comparison(Comparison::GreaterThanOrEqual) => match &right {
             Value::Int { val, .. } => compare_series_i64(&lhs, *val, ChunkedArray::gt_eq, lhs_span),
             Value::Float { val, .. } => {
-                compare_series_decimal(&lhs, *val, ChunkedArray::gt_eq, lhs_span)
+                compare_series_float(&lhs, *val, ChunkedArray::gt_eq, lhs_span)
             }
             Value::Date { val, .. } => {
                 compare_series_i64(&lhs, val.timestamp_millis(), ChunkedArray::gt_eq, lhs_span)
@@ -514,12 +509,7 @@ where
     }
 }
 
-fn compute_series_decimal<F>(
-    series: &Series,
-    val: f64,
-    f: F,
-    span: Span,
-) -> Result<Value, ShellError>
+fn compute_series_float<F>(series: &Series, val: f64, f: F, span: Span) -> Result<Value, ShellError>
 where
     F: Fn(ChunkedArray<Float64Type>, f64) -> ChunkedArray<Float64Type>,
 {
@@ -548,7 +538,7 @@ where
         _ => Err(ShellError::GenericError(
             "Incorrect type".into(),
             format!(
-                "Series of type {} can not be used for operations with a decimal value",
+                "Series of type {} can not be used for operations with a float value",
                 series.dtype()
             ),
             Some(span),
@@ -668,12 +658,7 @@ where
     }
 }
 
-fn compare_series_decimal<F>(
-    series: &Series,
-    val: f64,
-    f: F,
-    span: Span,
-) -> Result<Value, ShellError>
+fn compare_series_float<F>(series: &Series, val: f64, f: F, span: Span) -> Result<Value, ShellError>
 where
     F: Fn(&ChunkedArray<Float64Type>, f64) -> ChunkedArray<BooleanType>,
 {
@@ -702,7 +687,7 @@ where
         _ => Err(ShellError::GenericError(
             "Incorrect type".into(),
             format!(
-                "Series of type {} can not be used for operations with a decimal value",
+                "Series of type {} can not be used for operations with a float value",
                 series.dtype()
             ),
             Some(span),