[Tracking] C#/Models: resolve TODOs

[TheArcaneBrony]

Generated at commit 57827bc9:

• extra/admin-api/Models/Spacebar.Models.Config/ServerConfiguration.cs:54: // TODO: lazy
• extra/admin-api/Models/Spacebar.Models.Gateway/GuildMemberListUpdate.cs:73: // TODO: diff algo
• extra/admin-api/Models/Spacebar.Models.Gateway/GuildMemberListUpdate.cs:74: // TODO: snapshots
• extra/admin-api/Models/Spacebar.Models.Gateway/SbWebsocketMeta.cs:5: // TODO: move to interop
• extra/admin-api/Models/Spacebar.Models.Generic/PresenceResponse.cs:18: // TODO
• extra/admin-api/Models/Spacebar.Models.Generic/PresenceResponse.cs:22: // TODO