[Split] Implement Admin

[yitsushi]

Pending

• Instance: Implement Admin/Instance #56
• Promo: Implement Admin/Promo #65

Done

• Announcements: Implement Admin/Announcements #60
• Drive: Implement Admin/Drive #61
• Emoji: Implement Admin/Emoji #62
• Federation: Implement Admin/Federation #63
• Logs: Implement Admin/Logs #57
• Moderation: Implement Admin/Moderation #55
• Moderators: Implement Admin/Moderators #64
• Queue: Implement Admin/Queue #66
• Relays: Implement Admin/Relays #67
• Users / Accounts: Implement Admin/User #58

Documentation: https://misskey.io/api-doc#tag/admin

[yitsushi]

Closing because we have separate issues per section covering all endpoints under /admin.