Add new cli command 'command' to execute arbitrary commands (#692)

* Add new cli command 'command' to execute arbitrary commands

This deprecates 'raw-command', which requires positional argument for module,
in favor of new 'command' that accepts '--module' option for IOT devices.

* Pull block list to the module level

kasa/modules/emeter.py

@@ -63,7 +63,7 @@ class Emeter(Usage):
         self,
         data: List[Dict[str, Union[int, float]]],
         entry_key: str,
-        kwh: bool=True,
+        kwh: bool = True,
         key: Optional[int] = None,
     ) -> Dict[Union[int, float], Union[int, float]]:
         """Return emeter information keyed with the day/month.