Code-based plugin parameter docs

[bjoluc]

Making this PR against core-rewrite for cleaner diffs, but it should target v8 once #2858 is merged.

We can have mkdocs auto-generate plugin parameter tables to reduce some redundancy, prevent mismatches, and – by moving extended parameter descriptions into source files – improve in-editor code hints 🎉
This setup uses the mkdocs-macros plugin and TypeDoc under the hood: When writing {{ plugin_parameters('html-keyboard-response') }} in a plugin's documentation, mkdocs invokes a python function that uses TypeDoc to parse the plugin's index.ts, retrieving a JSON representation which it uses to generate and return the markdown table ✨

To try it, check out the PR, run npm install, poetry install and npm run docs:preview. The html-keyboard-response.md docs look the same, but were generated on-the-fly 👍 Editing packages/plugin-html-keyboard-response/src/index.ts rebuilds the documentation.

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[jodeleeuw]

Oh that's fantastic. I've been dreaming of something like this for a while and never had the time to figure out how to pull it off. Excited to try it out and make the switch.