Typescript support for extensions / extension development

Your idea

Currently we generate jsdoc files that then in turn are turned into a webpage, while this is useful, in my experience the best developer experience is gained using typescript (.d.ts) files + jsdoc comments, even when using plain .js files for the actual extensions.

I think it could also be nice to support .ts files directly. There wouldn't even need to be type checking etc. on the side of musescroe, I think it'd be valid to just ignore the types.

Problem to be solved

Make it easier to develop plugins using auto completion and other IDE features using the javascript LSP.

Prior art

No response

Additional context

No response

Checklist

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