docs: add overview for implemented requests

[Nerixyz]

I'll rebase this once #359 is merged.

This adds a script to generate an overview over the implemented requests and helpers. It requires Rust nightly and Deno. On a high level, the script reads the Twitch docs and matches the endpoints to the implemented endpoints in this crate.

# generate JSON from docs
RUSTDOCFLAGS='-Zunstable-options --output-format json' cargo doc --no-deps -F _all
# process JSON and Twitch docs (updates in-place)
deno run --allow-net --allow-read --allow-write tools/collect-endpoints.ts

CI will check if the docs are up-to-date and provide a diff if they're not.

Towards #330.

[Emilgardis]

would it be possible to do this for eventsub too?

[Nerixyz]

would it be possible to do this for eventsub too?

I've added an overview for eventsub, but the types are quite long.

before

Updated it to fit.