Change type to class in configuration files

[TeresiaOlsson]

I have made the updates so the default key in the configuration is class_path/class instead of type. Type is still supported so configuration files which are using the old format still is possible to load.

I could only change the BESSY II example for now since the others need PR python-accelerator-middle-layer/tango-pyaml#35 to be merged before they can be validated.

I also didn't change the configurations in the tests for now to avoid breaking it before the hackathon. For now I mostly want to update the files that users might look at to learn how to write the configuration so they learn the new format.

[gupichon]

Could you merge main into your branch to make sure everything is consistent with the recent changes?

[TeresiaOlsson]

Could you merge main into your branch to make sure everything is consistent with the recent changes?

I rebased it on the current main now.

[JeanLucPons]

Could you merge main into your branch to make sure everything is consistent with the recent changes?

I rebased it on the current main now.
Thanks

@gupichon
rebase + force push is the good way to do in a PR otherwise it blends history in the main and in your branch and some old code can reappear in conflict resolutions. I already experienced such issue. So please , in a PR, use rebase.