Add WESL support

[Weihnachtsbaum]

Adds support for WESL.

The test is failing, I don't know if I did something wrong 🤔
If I remove the nested comment block, the test passes.

[hexclover]

You probably want to use the nested option?

    "Rust": {
      "line_comment": ["//"],
      "multi_line_comments": [["/*", "*/"]],
      "nested": true, // <-------- This
      "important_syntax": ["///", "//!"],
      "extensions": ["rs"],
      "quotes": [["\\\"", "\\\""], ["#\\\"", "\\\"#"]],
      "verbatim_quotes": [["r##\\\"", "\\\"##"], ["r#\\\"", "\\\"#"]]
    },

[Weihnachtsbaum]

@hexclover Thank you, it works now :)