refactor state accessor, state cache, user, uiaa

src/database/key_value/rooms/state_accessor.rs

src/database/key_value/rooms/state_cache.rs

src/database/key_value/rooms/user.rs

src/database/key_value/uiaa.rs

src/service/rooms/state_accessor/data.rs

src/service/rooms/state_accessor/mod.rs

src/service/rooms/state_cache/data.rs

src/service/rooms/state_cache/mod.rs

src/service/rooms/user/data.rs

src/service/rooms/user/mod.rs

src/service/uiaa/data.rs

src/service/uiaa/mod.rs