Deprecating Present Proof V3 REST API

[Moopli]

With the backend merger of the present-proof protocol's handlers for V2 and V3, the REST API calls for V2 and V3 versions of endpoints go through the same handler.

To perform present proof V3, a REST client needs a connection with DIDComm V2, and then calls the present proof REST APIs (without V3 suffix), passing in the DIDs for that connection, for all calls that require MyDID and TheirDID.

We can remove the present proof V3 REST endpoints once clients are switched to the version-agnostic endpoints.