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/reporting/billing/PublishInvoicesAction.java

@@ -28,6 +28,7 @@ import com.google.appengine.api.taskqueue.TaskOptions;
 import com.google.common.flogger.FluentLogger;
 import com.google.common.net.MediaType;
 import google.registry.config.RegistryConfig.Config;
+import google.registry.reporting.ReportingModule;
 import google.registry.request.Action;
 import google.registry.request.Parameter;
 import google.registry.request.Response;
@@ -62,7 +63,7 @@ public class PublishInvoicesAction implements Runnable {
   @Inject
   PublishInvoicesAction(
       @Config("projectId") String projectId,
-      @Parameter(BillingModule.PARAM_JOB_ID) String jobId,
+      @Parameter(ReportingModule.PARAM_JOB_ID) String jobId,
       BillingEmailUtils emailUtils,
       Dataflow dataflow,
       Response response,