Add Contrib support for Inverter Heat Pump such as Fairland IPHR55

[valentindusollier]

This adds support for Inverter Heat Pump such as Fairland Inverter+ 21kW (IPHR55).

[valentindusollier]

I made the dotenv module optional. It is only use in /testcontrib.py in order to load environment variables from .env file. However it's not really needed. Moreover, this module is not installed in the workflows.

[uzlonewolf]

I do like the idea, but unfortunately python-dotenv only supports Python v3.8+ which is a bit too restrictive. At some point we should probably rework the whole contrib test system to add tests like this for the other contrib modules as well.

[valentindusollier]

Yes, you're right. I think the right way to go for now is to remove it from requirements.txt and leave it as optional in /testcontrib.py. This way those who have the module installed can use it but /testcontrib.py works fine without dotenv as well. What do you think ?

[uzlonewolf]

Yes, that sounds good.

[valentindusollier]

Done ✅

[jasonacox]

Thanks @valentindusollier !