* Add battery storage settings for enphase_envoy EU configuration
* Add EU Battery test fixture to enphase_envoy
* Add tests and snapshots for enphase_envoy EU battery
* refactor eu battery fixture to align with other enphase_envoy fixtures
* remove if from test and use test parameter for eu battery enphase_envoy tests
* Switch relay status from binary_sensor to switch
* docstring
* Bump pyenphase to 1.7.1
* review comments pt1
* review comments pt2
* Mutate data in lib instead of HA
* Bump pyenphase to 1.8.1