Adding Foobot device sensor (#12417)

* Added Foobot device sensor

* Added error handling tests

* Corrections after PR review.

* Migrated to async/await syntax

 * lint fixes
 * stop raising HomeAssistantError
 * debug log for number of requests

* Moved shared data between sensors from a class attribute to a separate class

* Made test more async-aware

disabled setup error test for now as it's not working

* Working failure scenarios tests

script/gen_requirements_all.py

@@ -47,6 +47,7 @@ TEST_REQUIREMENTS = (
     'ephem',
     'evohomeclient',
     'feedparser',
+    'foobot_async',
     'gTTS-token',
     'HAP-python',
     'ha-ffmpeg',