[WIP] MCP

[zth]

This bootstrap a simple MCP for ReScript, through Rewatch. Initially it adds a single command diagnose, which will run quick diagnostics for a single file. Diagnostics here means that we'll run a compilation only on the single file targeted, no dependents, so it's really quick. Warnings and errors are returned to the LLM.

Supersedes https://github.com/rescript-lang/rescript/pull/7566.

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rescript

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commit: ffdd6de