Moved QKD App NBI to NBI Component

manifests/nginx_ingress_http.yaml

manifests/qkd_appservice.yaml

src/common/Constants.py

src/common/Settings.py

src/nbi/service/__main__.py

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

src/nbi/service/rest_server/nbi_plugins/qkd_app/__init__.py

src/qkd_app/service/__main__.py

src/qkd_app/service/database/Engine.py

src/qkd_app/service/rest_server/RestServer.py

src/qkd_app/service/rest_server/__init__.py