Handle on/off through TemperatureSetting trait

[Swamp-Ig]

Description:

For climate(in HA)/thermostat (in GA), the reccomended traits are the TemperatureSetting trait only, and not the OnOff trait.

GA actually completely ignores the OnOff trait, and will process "turn on " and "turn off " commands only through the TemperatureSetting trait.

I have fixed this by removing climate from OnOff, and passing on turn on / off properly (by calling the turn_on and turn_off services).

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.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.