[Feature] Connections Part 2

Part 2 is the followup to #1009, bringing new features like Linked Roles, new core connection services, and new addon services.

• Core Connection Services
  • PayPal
  • Steam (uses old OID 2.0, ew)
  • TikTok
  • eBay
  • Crunchyroll
  • Xbox (Activity status)
  • League of Legends
  • Instagram
  • Contacts
• User Routes
  • Get User Application Role Connection
  • Update User Application Role Connection
• Connection Routes
  • Update Connection
    • Update Status Visibility
    • Update Metadata Visibility
• Connection Metadata
  • Reddit
  • Steam
  • Twitter
  • PayPal
  • TikTok
  • eBay
• Linked Roles
  • Get Configuration (GET /guilds/:guild_id/roles/:role_id/connections/configuration)
  • Update Configuration (PUT /guilds/:guild_id/roles/:role_id/connections/configuration)
  • Application Role Connection Metadata
• State timeout?
• Two Way Links

Addon Services:

• Multi instance connections (ex multiple Fosscord instances)
• Mastodon
• Revolt.chat
• OpenStreetMap
• Skype

Other TODOs:

• Response code should be checked against all 400 codes instead of just 401, and 400 (Refresh error responses)
• connection_id url parameter should be renamed to provider_id to match Discord and the existing error messages
• Create custom app to handle /connections route, to allow connecting to different FC/Mastodon/etc instances?

Making this an issue since theres obv no pr for part 2 yet

Start by reading the scope in this issue and the referenced follow-up issue #1009, then use the linked Discord API documentation for the listed routes, services, and metadata. No repository files or tests are named, and the work is complete only when the selected checklist items and related TODOs are implemented and verified.