Support for "composed device type"

[vves]

"9.2. Endpoint Composition"

Some devices like a combo refrigerator, freezer, while a single device has two Endpoints.

Need ability to add items to the 'partsList' in InteractionServer.ts.

[Apollon77]

This will come automatically with the new high level API I will work on next as soon as we tackled the current PR flood and some more points