Fix homekit_controller on climate-1.0

[Jc2k]

Description:

This fixes the tests for homekit_controller climate on the climate-1.0 branch. It also fixes a typo in climate (humitidy vs humidity)

Related issue (if applicable): #23899

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]

[pvizeli]

   @property
    def hvac_mode(self):
        """Return current operation ie. heat, cool, idle."""
        return self._current_mode

That is wrong. If you have a current action they match with CURRENT_* use hvac_action property.

[Jc2k]

Re: hvac_mode - the docstring in homekit_controller was wrong, and the variable names were confusing but the implementation was doing the right thing i think so i have:

• Fixed the docstrings based on what is in climate now
• Renamed _current_mode to _target_mode and documented what Apple think it means at the point where it is populated. It should now contain the mode the user has selected.
• _current_mode is now actually set to the current operating mode (it was previously getting put in self._state) with the CURRENT_ stuff. I.e. it contains what the device reports it is currently doing.
• Have added support for hvac_action
• Added a test to show hvac_mode and hvac_action are independent and not getting conflated in homekit_controller.

The homekit tests are still passing with these changes, and flake8 and pylint is passing for the homekit bits too.