Require that values that look like numbers parse as numberlike (#8635)

# Description

Require that any value that looks like it might be a number (starts with
a digit, or a '-' + digit, or a '+' + digits, or a special form float
like `-inf`, `inf`, or `NaN`) must now be treated as a number-like
value. Number-like syntax can only parse into number-like values.
Number-like values include: durations, ints, floats, ranges, filesizes,
binary data, etc.

# User-Facing Changes

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Just making sure we see this for release notes 😅 

This breaks any and all numberlike values that were treated as strings
before. Example, we used to allow `3,` as a bare word. Anything like
this would now require quotes or backticks to be treated as a string or
bare word, respectively.

# 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

> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```

# 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/tests/commands/str_/mod.rs

@@ -234,7 +234,7 @@ fn substrings_the_input() {
             cwd: dirs.test(), pipeline(
             r#"
                  open sample.toml
-                 | str substring 6,14 fortune.teller.phone
+                 | str substring '6,14' fortune.teller.phone
                  | get fortune.teller.phone
              "#
         ));
@@ -258,7 +258,7 @@ fn substring_errors_if_start_index_is_greater_than_end_index() {
             cwd: dirs.test(), pipeline(
             r#"
                  open sample.toml
-                 | str substring 6,5 fortune.teller.phone
+                 | str substring '6,5' fortune.teller.phone
              "#
         ));
 
@@ -283,7 +283,7 @@ fn substrings_the_input_and_returns_the_string_if_end_index_exceeds_length() {
             cwd: dirs.test(), pipeline(
             r#"
                  open sample.toml
-                 | str substring 0,999 package.name
+                 | str substring '0,999' package.name
                  | get package.name
              "#
         ));
@@ -307,7 +307,7 @@ fn substrings_the_input_and_returns_blank_if_start_index_exceeds_length() {
             cwd: dirs.test(), pipeline(
             r#"
                  open sample.toml
-                 | str substring 50,999 package.name
+                 | str substring '50,999' package.name
                  | get package.name
              "#
         ));
@@ -331,7 +331,7 @@ fn substrings_the_input_and_treats_start_index_as_zero_if_blank_start_index_give
             cwd: dirs.test(), pipeline(
             r#"
                  open sample.toml
-                 | str substring ,2 package.name
+                 | str substring ',2' package.name
                  | get package.name
              "#
         ));
@@ -355,7 +355,7 @@ fn substrings_the_input_and_treats_end_index_as_length_if_blank_end_index_given(
             cwd: dirs.test(), pipeline(
             r#"
                  open sample.toml
-                 | str substring 3, package.name
+                 | str substring '3,' package.name
                  | get package.name
              "#
         ));