Add npmx language server

[9romise]

• I've read CONTRIBUTING.md and followed the relevant guidance for adding or updating my extension.

npmx

Enhance your npm package workflow with diagnostics, hover, and completion features.

Features

• Hover links to package pages and docs on npmx.dev
• Version completion with provenance and prerelease settings
• Diagnostics for upgrades, deprecations, replacements, vulnerabilities, dist tags, and engine mismatches
• Document links for package names
• Workspace-aware dependency resolution for npm, pnpm, yarn, and bun projects
• Emoji icons in hover for non-VS Code editors

[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have @9romise 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'.

[9romise]

@cla-bot check

[cla-bot]

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

[MrSubidubi]

Thanks for this!

Please make sure your extension fulfills the extension publishing prerequisites. Particularly, you will need to update your extension ID as outlined in the documentation. Once you did the necessary updates, please update everything related here. Thanks!