Add JoinedRoom.sendStateEventRaw for raw state events
Expose a generic raw state-event sender on the matrix wrapper, mirroring the rust SDK,
for state events that have no dedicated typed method. Element Pro message retention
uses it to write the MSC1763 m.room.retention event.
Also bump the enterprise submodule to write message retention through it.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
