Supporting TSDoc in deno doc and dts emit

[lucacasonato]

Right now we only support TS type annotations in .ts files for both deno doc and fast check emit. We do not understand type annotations in TSDoc comments in .js files as of yet. We could do this, but it would require significant effort:

• New JSDoc / TSDoc parser that can handle parsing type expressions
• deno doc needs to understand type expressions in TSDoc
• Fast check needs to understand type expressions in TSDoc
• Fast check needs to emit type expressions in TSDoc to .d.ts files

[hrgdavor]

This is a blocker for me. I hope there more others like me regarding this issue, so there is incentive to tackle this.

I want to be typescript friendly, but refuse to to use it directly. It is my personal preference.