feat(AuditLog): add onboarding

[Victorsitou]

Summary

https://github.com/discord/discord-api-docs/pull/6041 ~~blocked by #928~~

I didn't add Server Guide types since that thing isn't documented yet.

Checklist

• [ ] update docs

• [x] If code changes were made, then they have been tested
  • [ ] I have updated the documentation to reflect the changes
  • [ ] I have formatted the code properly by running pdm lint
  • [ ] I have type-checked the code by running pdm pyright
• [ ] This PR fixes an issue
• [x] 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, ...)

[onerandomusername]

@Victorsitou would you please resolve conflicts?