Remove math eval command (#7284)

Reasoning: 

Most missing math commands are implemented with #7258.
The `meval` crate itself declares that it doesn't strive to stringent
standards (https://docs.rs/meval/latest/meval/#related-projects).
For example no particular special casing or transformations are
performed to ensure numerical stability. It uses the same rust `std`
library functions we use or have access to (and `f64`).
While the command call syntax in nushell may be a bit more verbose,
having a single source of truth and common commands is beneficial.
Furthermore the `math` commands can themselves implement broadcasting
over lists (or table columns).

Closes #7073

Removed dependencies:
- `meval`
- `nom 1.2.4` (duplicate)

User-Facing Changes:

Scripts using `math eval` will break. 
We remove a further `eval` like behavior to get results through runtime evaluation (albeit limited in scope)

Tests:

- Updated tests that internally used `math eval`.
- Removed one test that primarily used `math eval` to obtain a result from `str join`

crates/nu-command/tests/commands/math/eval.rs

@@ -1,85 +0,0 @@
-use nu_test_support::{nu, pipeline};
-
-#[test]
-fn evaluates_two_plus_two() {
-    let actual = nu!(
-        cwd: ".", pipeline(
-        r#"
-        math eval "2 + 2"
-        "#
-    ));
-
-    assert!(actual.out.contains('4'));
-}
-
-#[test]
-fn evaluates_two_to_the_power_four() {
-    let actual = nu!(
-        cwd: ".", pipeline(
-        r#"
-        echo "2 ^ 4" | math eval
-        "#
-    ));
-
-    assert!(actual.out.contains("16"));
-}
-
-#[test]
-fn evaluates_three_multiplied_by_five() {
-    let actual = nu!(
-        cwd: ".", pipeline(
-        r#"
-        echo "3 * 5" | math eval
-        "#
-    ));
-
-    assert!(actual.out.contains("15"));
-}
-
-#[test]
-fn evaluates_twenty_four_divided_by_two() {
-    let actual = nu!(
-        cwd: ".", pipeline(
-        r#"
-        echo "24 / 2" | math eval
-        "#
-    ));
-
-    assert!(actual.out.contains("12"));
-}
-
-#[test]
-fn evaluates_twenty_eight_minus_seven() {
-    let actual = nu!(
-        cwd: ".", pipeline(
-        r#"
-        echo "28 - 7" | math eval
-        "#
-    ));
-
-    assert!(actual.out.contains("21"));
-}
-
-#[test]
-fn evaluates_pi() {
-    let actual = nu!(
-        cwd: ".", pipeline(
-        r#"
-        math eval pi
-        "#
-    ));
-
-    assert!(actual.out.contains("3.14"));
-}
-
-#[test]
-fn evaluates_tau() {
-    let actual = nu!(
-        cwd: ".", pipeline(
-        r#"
-        math eval tau
-        "#
-    ));
-
-    assert!(actual.out.contains("6.28"));
-}

crates/nu-command/tests/commands/math/mod.rs

@@ -1,5 +1,4 @@
 mod avg;
-mod eval;
 mod median;
 mod round;
 mod sqrt;