Enforce keyword args to all public methods

Author: Georgios Hadjiharalambous

sdk/rt/speechmatics/rt/_async_client.py

@@ -167,7 +167,7 @@ async def stop_session(self) -> None:
         await self._session_done_evt.wait()  # Wait for end of transcript event to indicate we can stop listening
         await self.close()
 
-    async def force_end_of_utterance(self, timestamp: Optional[float] = None) -> None:
+    async def force_end_of_utterance(self, *, timestamp: Optional[float] = None) -> None:
         """
         This method sends a ForceEndOfUtterance message to the server to signal
         the end of an utterance. Forcing end of utterance will cause the final