feat: Add support for Deno LSP

[Vpr99]

This extends the Typescript LSP handler to:

• Detect Deno indicators (deno.json(c)) when identifying the nearest root
• Adds a conditional check to spawn the Deno LSP instead of tsserver if we're in a Deno project (based on the presence of Deno's lockfile or deno.json(c) files.)

Before: https://dev.opencode.ai/s/uV5vfbcO

After: https://dev.opencode.ai/s/QWJh0hnj

[jayair]

The before/after is cool!