Create Stackdriver module and inject it into backend module

This adds Stackdriver as a DI module into the registry codebase. This is a
necessary prerequisite for using Stackdriver based monitoring. For now, I'm
only adding it to the backend module as it will be more work to add it to the
frontend module.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=126730925

java/google/registry/monitoring/whitebox/BUILD

@@ -10,6 +10,9 @@ java_library(
     srcs = glob(["*.java"]),
     deps = [
         "//apiserving/discoverydata/bigquery:bigqueryv2",
+        "//google/monitoring:monitoring_java_lib",
+        "//java/com/google/api/client/http",
+        "//java/com/google/api/client/json",
         "//java/com/google/api/client/util",
         "//java/com/google/common/annotations",
         "//java/com/google/common/base",