Reduced LOC by replacing several instances of Value::Int {}, Value::Float{}, Value::Bool {}, and Value::String {} with Value::int(), Value::float(), Value::boolean() and Value::string() (#7412)

# Description

While perusing Value.rs, I noticed the `Value::int()`, `Value::float()`,
`Value::boolean()` and `Value::string()` constructors, which seem
designed to make it easier to construct various Values, but which aren't
used often at all in the codebase. So, using a few find-replaces
regexes, I increased their usage. This reduces overall LOC because
structures like this:
```
Value::Int {
  val: a,
  span: head
}
```
are changed into
```
Value::int(a, head)
```
and are respected as such by the project's formatter.
There are little readability concerns because the second argument to all
of these is `span`, and it's almost always extremely obvious which is
the span at every callsite.

# User-Facing Changes

None.

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-command/src/math/avg.rs

@@ -40,24 +40,14 @@ impl Command for SubCommand {
         vec![Example {
             description: "Compute the average of a list of numbers",
             example: "[-50 100.0 25] | math avg",
-            result: Some(Value::Float {
-                val: 25.0,
-                span: Span::test_data(),
-            }),
+            result: Some(Value::float(25.0, Span::test_data())),
         }]
     }
 }
 
 pub fn average(values: &[Value], head: &Span) -> Result<Value, ShellError> {
     let sum = reducer_for(Reduce::Summation);
-    let total = &sum(
-        Value::Int {
-            val: 0,
-            span: *head,
-        },
-        values.to_vec(),
-        *head,
-    )?;
+    let total = &sum(Value::int(0, *head), values.to_vec(), *head)?;
     match total {
         Value::Filesize { val, span } => Ok(Value::Filesize {
             val: val / values.len() as i64,
@@ -67,14 +57,7 @@ pub fn average(values: &[Value], head: &Span) -> Result<Value, ShellError> {
             val: val / values.len() as i64,
             span: *span,
         }),
-        _ => total.div(
-            *head,
-            &Value::Int {
-                val: values.len() as i64,
-                span: *head,
-            },
-            *head,
-        ),
+        _ => total.div(*head, &Value::int(values.len() as i64, *head), *head),
     }
 }