feat(website): show union members of type aliases

[Qjuh]

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

Adds a Union Members section on Type Alias documentation pages that references the different types the Type Alias is a union of. This section only shows if the Type Alias is a union.

Also refactored some types in mainlib typings to interfaces for better documentation purposes.

Removed the unused RecursiveArray type, which was identical to the RecursiveReadonlyArray type but never used.

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

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Name	Status	Preview	Comments	Updated (UTC)
discord-js	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 1, 2023 1:15am

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
discord-js-guide	⬜️ Ignored (Inspect)	Visit Preview		Dec 1, 2023 1:15am

[codecov]

Codecov Report

Attention: 86 lines in your changes are missing coverage. Please review.

Comparison is base (cbbbfb9) 58.79% compared to head (dcd6533) 58.49%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
apps/website/src/components/model/TypeAlias.tsx	0.00%	51 Missing ⚠️
...ents/documentation/section/UnionMembersSection.tsx	0.00%	35 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10001      +/-   ##
==========================================
- Coverage   58.79%   58.49%   -0.30%     
==========================================
  Files         240      241       +1     
  Lines       17033    17118      +85     
  Branches     1240     1241       +1     
==========================================
  Hits        10014    10014              
- Misses       6974     7059      +85     
  Partials       45       45              

Flag	Coverage Δ
website	0.00% <0.00%> (ø)

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