Add activity report generation code

This adds Bigquery API client code to generate the activity reports from our
now standardSQL queries. The naming mirrors that of RDE (Staging generates the
reports and uploads them to GCS).

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=164656344

java/google/registry/reporting/sql/dns_counts.sql

@@ -1,3 +1,4 @@
+#standardSQL
   -- Copyright 2017 The Nomulus Authors. All Rights Reserved.
   --
   -- Licensed under the Apache License, Version 2.0 (the "License");