Range refactor (#12405)

# Description
Currently, `Range` is a struct with a `from`, `to`, and `incr` field,
which are all type `Value`. This PR changes `Range` to be an enum over
`IntRange` and `FloatRange` for better type safety / stronger compile
time guarantees.

Fixes: #11778 Fixes: #11777 Fixes: #11776 Fixes: #11775 Fixes: #11774
Fixes: #11773 Fixes: #11769.

# User-Facing Changes
Hopefully none, besides bug fixes.

Although, the `serde` representation might have changed.

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

@@ -92,7 +92,7 @@ pub fn calculate(
         }
         PipelineData::Value(Value::Range { val, .. }, ..) => {
             let new_vals: Result<Vec<Value>, ShellError> = val
-                .into_range_iter(None)?
+                .into_range_iter(span, None)
                 .map(|val| mf(&[val], span, name))
                 .collect();