feat(zs500): initial device support for heat pump

[JorgenEvens]

This adds support for a Zs500 series heat pump.

The mobile app uses AWS IOT Core to communicate with the heat pump so the code replicates that behaviour.

[flz]

Thank you for the contribution! I'll spend some time reviewing the code when I get a chance but in the meantime, please add unittests similar to those that exist for iaqua.

[JorgenEvens]

I've implemented the tests. There is a small set of tests that were implemented in the Test Base classes that were not relevant to the implementation using the AWS IOT Core SDK.

[bb3rni]

Were the tests successful? What needs to be done to add support for this heat pump?

[bb3rni]

Can i test the changed files myself? https://github.com/EvensSolutions/iaqualink-py does not match https://github.com/home-assistant/core/tree/dev/homeassistant/components/iaqualink so how can i import these files into Home Assistant?

[JorgenEvens]

This project is the library used by the iaqualink component in home assistant. They are not the same things, testing it out involves getting an updated version of this library published on or in any other way swapped out in the component.

I prefer to get my changes merged into this library rather than publish another package.

[JorgenEvens]

@flz Is there still any interest in this PR?

[JorgenEvens]

I've rebased this PR on the latest master branch.