Merge branch 'feat/245-cttc-define-fields-to-specify-type-of-link' into 'develop'

proto/context.proto

src/context/service/database/Connection.py

src/context/service/database/Context.py

src/context/service/database/Device.py

src/context/service/database/Link.py

src/context/service/database/OpticalLink.py

src/context/service/database/PolicyRule.py

src/context/service/database/Service.py

src/context/service/database/Slice.py

src/context/service/database/Topology.py

src/context/service/database/models/LinkModel.py

src/context/service/database/models/enums/LinkType.py

src/nbi/service/rest_server/nbi_plugins/tfs_api/Resources.py

src/webui/service/device/routes.py

src/webui/service/link/routes.py

src/webui/service/templates/link/detail.html

src/webui/service/templates/link/home.html