add syntax_highlight.languages()

[mhils]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a new Python API export for retrieving supported syntax highlighting languages while refactoring existing functions to use a new as_str() conversion.

• Updated syntax highlighting functions in mitmproxy-rs/src/syntax_highlight.rs to use as_str().
• Added a new languages() function and updated module exports in mitmproxy-rs/src/lib.rs.
• Modified the syntax_highlight getter in mitmproxy-rs/src/contentviews.rs to return a &'static str.
• Introduced a new VALUES array and as_str() method for Language in mitmproxy-highlight/src/lib.rs.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
mitmproxy-rs/src/syntax_highlight.rs	Refactored tag conversion and added a new languages() function.
mitmproxy-rs/src/lib.rs	Updated module exports to include the new languages() function.
mitmproxy-rs/src/contentviews.rs	Changed syntax_highlight getter to return a static string reference.
mitmproxy-highlight/src/lib.rs	Added Language::VALUES and renamed to_str() to as_str() for Tag.

Comments suppressed due to low confidence (1)

mitmproxy-rs/src/contentviews.rs:120

• Changing the return type from String to a static string reference may lead to lifetime or API compatibility issues. Ensure the underlying value is truly static or update dependent code accordingly.

pub fn syntax_highlight(&self) -> &'static str {