feat: add user-installable apps support

[TAEMBO]

Please describe the changes this PR makes and why it should be merged:
This PR adds support for user installable apps.

• Add docs for user-installed apps discord/discord-api-docs#6723

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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[Jiralite]

Quick question, why are these addX() and not setX()?

[vladfrangu]

I concur with @Jiralite here, they should be setX. To be honest addX rarely makes sense in the context of a command builder

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.29%. Comparing base (b8397b2) to head (66d35c1).

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #10348       +/-   ##
===========================================
+ Coverage   50.10%   63.29%   +13.18%     
===========================================
  Files         228      131       -97     
  Lines       20533    16426     -4107     
  Branches     1236     1143       -93     
===========================================
+ Hits        10289    10397      +108     
+ Misses      10199     5984     -4215     
  Partials       45       45               

Flag	Coverage Δ
builders	95.91% <100.00%> (+0.12%)	⬆️

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Resolved.