Add an implementation for a MockVersionService

[rafaelmag110]

WHAT

We should provide a mock implementation of the VersionService interface in the mock-connector runtime.

WHY

With the update to edc 0.11.0-20241213-SNAPSHOT, the protocol api was excluded from the mock-connector runtime since no mock provider was implemented for the VersionService. If we want to keep the protocol api available for mocking, we have to provide an implementation for it.

[bmg13]

The next is a proposing solution for this issue:

In the mock-connector runtime and a implementation stub (similar to existing ones) for VersionProtocolService that implements both AbstractServiceStub and VersionProtocolService. Something similar to the next.

public class VersionProtocolServiceStub extends AbstractServiceStub implements VersionProtocolService {

    public VersionProtocolServiceStub(ResponseQueue responseQueue) {
        super(responseQueue);
    }

    @Override
    public ServiceResult<ProtocolVersions> getAll(TokenRepresentation tokenRepresentation) {
        return responseQueue.getNext(ProtocolVersions.class, "Error retrieving ProtocolVersions: %s");
    }
}

and in the MockServiceExtension provide the new VersionProtocolServiceStub similar to the ones already provided.

The exclusion of the protocol api can be now removed.

Helpful context on this approach: #1264

[bmg13]

Once triaged, could I be assigned this one?