Add module support & query their information during update cycle (#243)

* Add module support & modularize existing query

This creates a base to expose more features on the supported devices.
At the moment, the most visible change is that each update cycle gets information from all available modules:
* Basic system info
* Cloud (new)
* Countdown (new)
* Antitheft (new)
* Schedule (new)
* Time (existing, implements the time/timezone handling)
* Emeter (existing, partially separated from smartdevice)

* Fix imports

* Fix linting

* Use device host instead of alias in module repr

* Add property to list available modules, print them in cli state report

* usage: fix the get_realtime query

* separate usage from schedule to avoid multi-inheritance

* Fix module querying

* Add is_supported property to modules

kasa/smartplug.py

@@ -2,6 +2,7 @@
 import logging
 from typing import Any, Dict
 
+from kasa.modules import Antitheft, Cloud, Schedule, Time, Usage
 from kasa.smartdevice import DeviceType, SmartDevice, requires_update
 
 _LOGGER = logging.getLogger(__name__)
@@ -40,6 +41,11 @@ class SmartPlug(SmartDevice):
         super().__init__(host)
         self.emeter_type = "emeter"
         self._device_type = DeviceType.Plug
+        self.add_module("schedule", Schedule(self, "schedule"))
+        self.add_module("usage", Usage(self, "schedule"))
+        self.add_module("antitheft", Antitheft(self, "anti_theft"))
+        self.add_module("time", Time(self, "time"))
+        self.add_module("cloud", Cloud(self, "cnCloud"))
 
     @property  # type: ignore
     @requires_update