feat(label): add label package (#1339)
feat(label): add label package (#1339)

* feat(label): add label package

Signed-off-by: Douglas Reid <5824f1293f78a6d336a38973f53e0782b086eb89@google.com>

* add copyright banner

Signed-off-by: Douglas Reid <5824f1293f78a6d336a38973f53e0782b086eb89@google.com>
istio/api,istio/api,istio/api,istio/api