feat: add {add,remove}GroupDMRecipient methods

[almeidx]

Added a script that checks which Routes are not being used in /core.

The only missing routes besides the ones implemented here are guildMemberVerification (not documented) and guildIncidentActions (#10727)

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
discord-js	Ready	Preview	Comment	Oct 8, 2025 8:33am
discord-js-guide	Ready	Preview	Comment	Oct 8, 2025 8:33am

[codecov]

Codecov Report

❌ Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.24%. Comparing base (a78dd01) to head (3c333a8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/core/src/api/channel.ts	0.00%	23 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11135   +/-   ##
=======================================
  Coverage   44.24%   44.24%           
=======================================
  Files         313      313           
  Lines       18072    18051   -21     
  Branches     1796     1790    -6     
=======================================
- Hits         7996     7987    -9     
+ Misses      10064    10052   -12     
  Partials       12       12           

Flag	Coverage Δ
core	0.91% <0.00%> (-0.01%)	⬇️

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Resolved