feat: support user guilds

[sdanialraza]

Please describe the changes this PR makes and why it should be merged:

• Document user guild tags  discord/discord-api-docs#6836

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR changes the library's interface (methods or parameters added)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.34%. Comparing base (1105ec9) to head (fbbaebf).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10962      +/-   ##
==========================================
- Coverage   44.42%   42.34%   -2.08%     
==========================================
  Files         308      263      -45     
  Lines       17583    16018    -1565     
  Branches     1748     1532     -216     
==========================================
- Hits         7811     6783    -1028     
+ Misses       9759     9223     -536     
+ Partials       13       12       -1     

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Resolved.