sendText not possible via room aliases #12
Description
Sending a test message only works using the rooms internal id (e.g. !jCmKkFSxYzslrPkNiI:host.service.ch) not its aliases (e.g. #public:host.service.ch)
Support for resolving a room alias first allowing for direct use would be good, ref. https://spec.matrix.org/latest/#room-aliases resp. https://spec.matrix.org/v1.11/client-server-api/#room-aliases