Handle limits above 100 notes for *key instances, handle rate limits

[LunyaPet]

This fix is aimed at *key instances (Sharkey, CherryPick) which limit fetching of notes (the /api/users/notes endpoint) to 100 notes per fetch. Here's a list of fixes that I've done:

• The Misskey note fetcher fetches 100 notes per request, instead of any higher number (if the default parameters are changed above that number). This means that one can change the parameters in the script to e.g. 300 notes (https://fedi-circles.yourwalls.today) and it will still work.
• Basic rate limiting handling was added, if a rate limit is hit, it will retry the request a bit later. (Sharkey gets triggered a lot when doing this)