support multiplication operation on string and list values (#8061)

# Description

As title, I found this feature is useful to me too :)

Closes: #8039

# User-Facing Changes

```
❯ 3 * "ab"
ababab

❯ 3 * [1 2 3]
╭───┬───╮
│ 0 │ 1 │
│ 1 │ 2 │
│ 2 │ 3 │
│ 3 │ 1 │
│ 4 │ 2 │
│ 5 │ 3 │
│ 6 │ 1 │
│ 7 │ 2 │
│ 8 │ 3 │
╰───┴───╯
```

# 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/tests/commands/math/mod.rs

@@ -543,3 +543,31 @@ fn append_binary_values() {
     ));
     assert_eq!(actual.out, "0x[01020304]");
 }
+
+#[test]
+fn int_multiple_string() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"3 * "ab""#
+    ));
+    assert_eq!(actual.out, "ababab");
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#""ab" * 3"#
+    ));
+    assert_eq!(actual.out, "ababab");
+}
+
+#[test]
+fn int_multiple_list() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"3 * [1 2] | to nuon"#
+    ));
+    assert_eq!(actual.out, "[1, 2, 1, 2, 1, 2]");
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"[1 2] * 3 | to nuon"#
+    ));
+    assert_eq!(actual.out, "[1, 2, 1, 2, 1, 2]");
+}