feat(presence): implement presence functionality

src/api/client_server/presence.rs

src/api/client_server/profile.rs

src/api/client_server/sync.rs

src/api/server_server.rs

src/config/mod.rs

src/database/key_value/rooms/edus/presence.rs

src/database/mod.rs

src/service/globals/mod.rs

src/service/rooms/edus/presence/data.rs

src/service/rooms/edus/presence/mod.rs

src/service/sending/mod.rs

src/utils/mod.rs