admin debug command to fetch a server's true destination

src/api/client_server/account.rs

src/api/client_server/report.rs

src/api/client_server/state.rs

src/database/mod.rs

src/service/admin/debug/debug_commands.rs

src/service/admin/debug/mod.rs

src/service/admin/mod.rs

src/service/admin/room/room_moderation_commands.rs

src/service/rooms/timeline/mod.rs

src/service/sending/mod.rs

src/service/sending/send.rs