[kermi] Support for kermi x-center heat pump

[col-panic]

I work on implementing support for the kermi heat-pump x-center manager.

This issue is to track the contribution progress.

More information will follow.

[col-panic]

Draft PR #15687

[col-panic]

Channels are now dynamically resolved after traversing all datapoints. Number and OnOff channels are already implemented. Multiple enhancements and refactorings.

Sample Thing channel overview for drinkingwater heating

[canstar86]

Hi col-panic,
thanks a lot for doing that kermi integration. I highly appreciate and I am looking forward to add it to my openhab instance.
Since I'm just a noob in developing and GitHub, unfortunately, I cannot assist in development. But if you could let me know how to install the binding at this state, I would love to test it.
Thanks a lot

[col-panic]

Please have a look at #16329 - development on this implementation is currently halted.