Add CodeLens UI

[mustakimali]

Adds code lens support that shows reference and implementation counts. Clicking a code lens item triggers the corresponding action (Find All References Or Implementation). Currently tested with Rust-analyzer only.

• Code lens aligns to the line's indentation level
• Disabled by default - opt in via "code_lens": { "enabled": true } in settings or the "Toggle Code Lens" command
  • This let me test with other languages and fix any bugs
• Shows a loading toast when enabled via toggle
• Debounce configurable via "code_lens": { "debounce": 300 }

Closes: #11565

Release Notes:

• Added code lens support showing reference counts, implementations, and other LSP metadata above code symbols. Disabled by default - enable via "code_lens": { "enabled": true } in settings or the "Toggle Code Lens" command.

[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have @mustakimali on file. You can sign our CLA at https://zed.dev/cla. Once you've signed, post a comment here that says '@cla-bot check'.

[zed-industries-bot]

	Warnings
⚠️	This PR is missing release notes. Please add a "Release Notes" section that describes the change: Release Notes: - Added/Fixed/Improved ... If your change is not user-facing, you can use "N/A" for the entry: Release Notes: - N/A

Generated by 🚫 dangerJS against 45dff64

[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have @mustakimali on file. You can sign our CLA at https://zed.dev/cla. Once you've signed, post a comment here that says '@cla-bot check'.

[mustakimali]

@cla-bot check

[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have @mustakimali on file. You can sign our CLA at https://zed.dev/cla. Once you've signed, post a comment here that says '@cla-bot check'.

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[mustakimali]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[SomeoneToIgnore]

Thank you, we'll need a bit more work than that and hopefully #48923 will get reopened and worked on later.

[mustakimali]

Thank you, we'll need a bit more work than that and hopefully #48923 will get reopened and worked on later.

@SomeoneToIgnore is this feature already in the roadmap? if yes then when do you aim to release it?
This is the only missing feature that is preventing me from using zed on larger projects. Would be nice if we could implement it soon.

[mustakimali]

Anyone looking for this - it's landed #54100 (Thanks to @SomeoneToIgnore)