feat: Update command trait to allow string commands (#543)

Author: allenporter

roborock/devices/traits/v1/command.py

@@ -14,7 +14,7 @@ def __post_init__(self) -> None:
         """
         self._rpc_channel = None
 
-    async def send(self, command: RoborockCommand, params: dict[str, Any] | None = None) -> Any:
+    async def send(self, command: RoborockCommand | str, params: dict[str, Any] | None = None) -> Any:
         """Send a command to the device."""
         if not self._rpc_channel:
             raise ValueError("Device trait in invalid state")