* Cleanup async_track_state_change and augment docstrings.
Skip from_state and to_state matching in
async_track_state_change when they are None
Optimize the state change listener for the most
common use case: no to_state and from_state
matching.
* Update benchmark to be more realistic (previously we assumed only one entity was present in the whole instance)
* Add more tests to ensure behavior is preserved
* Ensure new behavior matches test
* remove MATCH_ALL from zone automation since its the default anyways
* Might as well use async_track_state_change_event instead since MATCH_ALL is removed
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