Defined/Corrected skeleton for Interdomain component

src/interdomain/Dockerfile

src/interdomain/client/InterdomainClient.py

src/interdomain/proto/__init__.py

src/interdomain/proto/interdomain_pb2_grpc.py

src/interdomain/proto/kpi_sample_types_pb2.py

src/interdomain/proto/service_pb2.py

src/interdomain/proto/slice_pb2.py

src/interdomain/requirements.in

src/interdomain/service/InterdomainService.py

src/interdomain/service/InterdomainServiceServicerImpl.py

src/interdomain/service/__main__.py