Add cloud module for smartdevice (#767)

Add initial support for the cloud module.

Adds a new binary sensor: `Cloud connection (cloud_connection): False`

kasa/tests/fakeprotocol_smart.py

@@ -46,6 +46,7 @@ class FakeSmartTransport(BaseTransport):
 
     FIXTURE_MISSING_MAP = {
         "get_wireless_scan_info": ("wireless", {"ap_list": [], "wep_supported": False}),
+        "get_connect_cloud_state": ("cloud_connect", {"status": 1}),
         "get_on_off_gradually_info": ("on_off_gradually", {"enable": True}),
     }