Correct humidifier detection in venstar component and add tests (#50439)

As of version 0.14, the venstar_colortouch lib always initializes hum_setpoint to None. When a thermostat actually reports a humidifier state, this value is replaced with the integer value of the setpoint. This changeset corrects the humidifier detection as well as adds basic test cases for the Venstar component.

tests/fixtures/venstar/colortouch_info.json

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+{"name":"COLORTOUCH","mode":1,"state":0,"fan":0,"fanstate":0,"tempunits":0,"schedule":0,"schedulepart":255,"away":0,"spacetemp":71.0,"heattemp":69.0,"cooltemp":74.0,"cooltempmin":35.0,"cooltempmax":99.0,"heattempmin":35.00,"heattempmax":99.0,"activestage":0,"hum_active":0,"hum":41,"hum_setpoint":30,"dehum_setpoint":99,"setpointdelta":2.0,"availablemodes":0}

tests/fixtures/venstar/colortouch_root.json

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+{"api_ver":7,"type":"residential","model":"COLORTOUCH","firmware":"5.1"}

tests/fixtures/venstar/colortouch_sensors.json

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+{"sensors":[{"name":"Thermostat","temp":70.0,"hum":41},{"name":"Space Temp","temp":70.0}]}

tests/fixtures/venstar/t2k_info.json

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+{"name":"T2000","mode":0,"state":0,"activestage":0,"fan":0,"fanstate":0,"tempunits":0,"schedule":0,"schedulepart":1,"away":0,"spacetemp":14.5,"heattemp":10.0,"cooltemp":29.5,"cooltempmin":2.0,"cooltempmax":37.0,"heattempmin":2.0,"heattempmax":37.0,"setpointdelta":2,"availablemodes":2}

tests/fixtures/venstar/t2k_root.json

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+{"api_ver": 7, "type": "residential", "model": "T2000", "firmware": "4.38"}

tests/fixtures/venstar/t2k_sensors.json

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+{"sensors": [{"name":"Thermostat","temp":14},{"name":"Space Temp","temp":14}]}