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/modules/cloud.py

@@ -0,0 +1,50 @@
+"""Cloud module implementation."""
+from pydantic import BaseModel
+
+from .module import Module
+
+
+class CloudInfo(BaseModel):
+    """Container for cloud settings."""
+
+    binded: bool
+    cld_connection: int
+    fwDlPage: str
+    fwNotifyType: int
+    illegalType: int
+    server: str
+    stopConnect: int
+    tcspInfo: str
+    tcspStatus: int
+    username: str
+
+
+class Cloud(Module):
+    """Module implementing support for cloud services."""
+
+    def query(self):
+        """Request cloud connectivity info."""
+        return self.query_for_command("get_info")
+
+    @property
+    def info(self) -> CloudInfo:
+        """Return information about the cloud connectivity."""
+        return CloudInfo.parse_obj(self.data["get_info"])
+
+    def get_available_firmwares(self):
+        """Return list of available firmwares."""
+        return self.query_for_command("get_intl_fw_list")
+
+    def set_server(self, url: str):
+        """Set the update server URL."""
+        return self.query_for_command("set_server_url", {"server": url})
+
+    def connect(self, username: str, password: str):
+        """Login to the cloud using given information."""
+        return self.query_for_command(
+            "bind", {"username": username, "password": password}
+        )
+
+    def disconnect(self):
+        """Disconnect from the cloud."""
+        return self.query_for_command("unbind")