Add Spec11 registrar emailing mechanism

This adds the terminal step of the Spec11 pipeline- processing the output of
the Beam pipeline to send an e-mail to each registrar informing them of
identified 'bad urls.'

This also factors out methods common between invoicing (which uses similar beam pipeline tools) and spec11 to the common superpackage ReportingModule + ReportingUtils classes.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=210932496

java/google/registry/env/common/backend/WEB-INF/web.xml

@@ -115,6 +115,15 @@
     <url-pattern>/_dr/task/generateSpec11</url-pattern>
   </servlet-mapping>
 
+  <!--
+    Publishes the Spec11 report for the month, emailing registrars about their
+    registrations which were flagged by the SafeBrowsing API.
+  -->
+  <servlet-mapping>
+    <servlet-name>backend-servlet</servlet-name>
+    <url-pattern>/_dr/task/publishSpec11</url-pattern>
+  </servlet-mapping>
+
   <!-- Trademark Clearinghouse -->
 
   <!-- Downloads TMCH DNL data from MarksDB. -->

java/google/registry/env/common/default/WEB-INF/queue.xml

@@ -126,9 +126,9 @@
     </retry-parameters>
   </queue>
 
-  <!-- Queue for tasks to generate or upload monthly invoices. -->
+  <!-- Queue for tasks that wait for a Beam pipeline to complete (i.e. Spec11 and invoicing). -->
   <queue>
-    <name>billing</name>
+    <name>beam-reporting</name>
     <rate>1/m</rate>
     <max-concurrent-requests>1</max-concurrent-requests>
     <retry-parameters>