Deprecation of the Register API

The experimental register API will be replaced with a metadata based register interface.

Do not use the API directly, prefer to use the property API for now. The new register interfaces can be implemented in TEMU 5.

Sunset Period

Legacy experimental register API will be removed in TEMU 5.

Impact

As the API was experimental, there should be minimum impact. Update code to register properties and not registers. In TEMU 5 add relevant temu_RegisterIface to models.