Consolidate listen events, fetchable events and return types from thread actions

This is a list of things that happen in threads, that we could parse and return in `fetch_messages`, that we could return from the relevant methods, and that we could return when listening.

This is mostly here to help myself get an overview of this, because it's something I want to fix for `v2`.

My idea is that we could make something like this work:
```python
import fbchat
session = fbchat.Session.login('', '')
user = fbchat.User(session=session, id=session.user_id)

# Wave to the user
wave = user.send_wave()
assert isinstance(wave, fbchat.Wave)

# Fetch the latest event in the thread (which would be a wave)
(wave,) = user.fetch_events(limit=1)
assert isinstance(wave, fbchat.Wave)

# Listen to incoming waves
listener = fbchat.Listener(session=session)
@listener.register
def on_wave(wave: fbchat.Wave):
assert isinstance(wave, fbchat.Wave)
listener.listen()
```

Possible:
- [ ] `ThreadABC.wave`
- [ ] `ThreadABC.send_text`
- [ ] `ThreadABC.send_emoji`
- [ ] `ThreadABC.send_sticker`
- [ ] `ThreadABC.send_location`
- [ ] `ThreadABC.send_pinned_location`
- [ ] `ThreadABC.send_files`
- [x] `ThreadABC.set_nickname`
- [x] `ThreadABC.set_color`
- [x] `ThreadABC.set_emoji`
- [ ] `ThreadABC.create_plan` - We won't get an ID after sending
- [ ] `ThreadABC.create_poll`
- [x] `Group.add_participants` - Though if admin approval is on, it's a little wierd
- [x] `Group.remove_participant`
- [ ] `Group.add_admins`
- [ ] `Group.remove_admins`
- [x] `Group.set_title`
- [ ] `Group.set_image` - Uses `ForcedFetch`
- [ ] `Group.set_approval_mode`

Impossible in `fetch_messages`, possible while listening:
- [x] `ThreadABC.start_typing`
- [x] `ThreadABC.stop_typing`
- [ ] `ThreadABC.mute`
- [ ] `ThreadABC.unmute`
- [ ] `ThreadABC.mute_reactions`
- [ ] `ThreadABC.unmute_reactions`
- [ ] `ThreadABC.mute_mentions`
- [ ] `ThreadABC.unmute_mentions`
- [ ] `Group.deny_users`
- [ ] `ThreadABC.mark_as_spam`
- [ ] `User.confirm_friend_request`
- [ ] `User.block`
- [ ] `User.unblock`

Fully impossible:
- [ ] `Group.accept_users` - Gives the same output as `.add_participants`
- [ ] `ThreadABC.forward_attachment` - You can detect whether the message was forwarded or not, but you can't see the source!
- [ ] `User.remove_friend`