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