tree-sitter : make optional

[stayhydated]

Description

Make tree-sitter optional

How to Test

cargo check -p gpui-component --no-default-features
cargo check -p gpui-component --features tree-sitter-languages
cargo check -p gpui-component --target wasm32-unknown-unknown
cargo check -p gpui-component --target wasm32-unknown-unknown --features tree-sitter-languages
cargo check --workspace
cargo test -p gpui-component --no-default-features
cargo test -p gpui-component --features tree-sitter-languages

Checklist

• I have read the CONTRIBUTING document and followed the guidelines.
• Reviewed the changes in this PR and confirmed AI generated code (If any) is accurate.
• Passed cargo run for story tests related to the changes.
• Tested macOS, Windows and Linux platforms performance (if the change is platform-specific)