feat: add more raw events

[BobDotCom]

Summary

This PR is a continuation of #1862

Events Added

• raw_member_remove
  • documented
• raw_thread_update
  • documented
• raw_thread_member_remove
  • documented

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.

[codecov]

Codecov Report

Merging #1880 (73d1324) into master (44ad1a9) will increase coverage by 0.00%.
The diff coverage is 23.25%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1880   +/-   ##
=======================================
  Coverage   33.33%   33.33%           
=======================================
  Files          97       97           
  Lines       18754    18786   +32     
=======================================
+ Hits         6251     6263   +12     
- Misses      12503    12523   +20     

Flag	Coverage Δ
macos-latest-3.10	33.32% <23.25%> (?)
macos-latest-3.11	33.32% <23.25%> (?)
macos-latest-3.8	33.33% <23.25%> (?)
macos-latest-3.9	33.33% <23.25%> (?)
ubuntu-latest-3.10	33.32% <23.25%> (-0.01%)	⬇️
ubuntu-latest-3.11	33.32% <23.25%> (-0.01%)	⬇️
ubuntu-latest-3.8	33.33% <23.25%> (-0.01%)	⬇️
ubuntu-latest-3.9	33.33% <23.25%> (-0.01%)	⬇️
windows-latest-3.10	33.32% <23.25%> (?)
windows-latest-3.8	33.33% <23.25%> (?)
windows-latest-3.9	33.33% <23.25%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
discord/flags.py	76.09% <ø> (ø)
discord/state.py	14.70% <0.00%> (-0.13%)	⬇️
discord/raw_models.py	30.28% <45.45%> (+2.18%)	⬆️
discord/player.py	25.32% <0.00%> (+0.32%)	⬆️
discord/sinks/core.py	40.42% <0.00%> (+1.06%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 44ad1a9...73d1324. Read the comment docs.