* Added the hvac action attribute for modbus climate entities.
* Fixed issue in hvac action unit test, was incorrectly referencing the hvac mode attribute.
* Fixed the modbus climate test for hvac action, it now correctly checks that hvac actions in the config match HVACActions.
* Made changes recommended by @crug80 to remove dead code and to add ability to use input or holding register for hvac action.
* Moved action test case in test_climate.py
* Updated comment for `test_service_climate_action_update`
* Fixed ruff formatting error.
* Addressed request to update labels from `state_*` to `action_*`
95afebceb4