Add activity reporting SQL query generation code

This allows us to have a modular view of all tables used in activity reporting, to facilitate generating reports in BigQuery.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=161849007

java/google/registry/reporting/sql/registrar_operating_status.sql

@@ -0,0 +1,32 @@
+  -- Copyright 2017 The Nomulus Authors. All Rights Reserved.
+  --
+  -- Licensed under the Apache License, Version 2.0 (the "License");
+  -- you may not use this file except in compliance with the License.
+  -- You may obtain a copy of the License at
+  --
+  --     http://www.apache.org/licenses/LICENSE-2.0
+  --
+  -- Unless required by applicable law or agreed to in writing, software
+  -- distributed under the License is distributed on an "AS IS" BASIS,
+  -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  -- See the License for the specific language governing permissions and
+  -- limitations under the License.
+
+  -- Query for all registrar statuses:
+  -- production, ramping up (OTE), or pre-ramp-up (requested).
+
+SELECT
+  -- Applies to all TLDs, hence the 'null' magic value.
+  STRING(NULL) AS tld,
+  CASE WHEN access_type = 'PROD' AND registrar_name IS NOT NULL
+    THEN 'operational-registrars'
+  WHEN access_type = 'OTE' AND registrar_name IS NOT NULL
+    THEN 'ramp-up-registrars'
+  WHEN access_type IS NULL AND registrar_name IS NOT NULL
+    THEN 'pre-ramp-up-registrars'
+  -- The import process is imprecise; filter out invalid rows.
+  ELSE 'not-applicable' END AS metricName,
+  INTEGER(COUNT(registrar_id)) AS count
+FROM
+  [%REGISTRAR_DATA_SET%.%REGISTRAR_STATUS_TABLE%]
+GROUP BY metricName