Add reporting retry, emailing and better logging

This change:
- Adds retries to the staging action
- Emails domain-registry-eng@ upon completion of either action
- Simplifies logging to be more useful

TODO: fix up Module @Inject naming conventions and yearMonth injection

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=173294822

java/google/registry/reporting/IcannReportingModule.java

@@ -28,6 +28,7 @@ import google.registry.bigquery.BigqueryConnection;
 import google.registry.request.HttpException.BadRequestException;
 import google.registry.request.Parameter;
 import google.registry.util.Clock;
+import google.registry.util.SendEmailService;
 import java.util.Optional;
 import javax.servlet.http.HttpServletRequest;
 import org.joda.time.Duration;
@@ -138,5 +139,10 @@ public final class IcannReportingModule {
       throw new RuntimeException("Could not initialize BigqueryConnection!", e);
     }
   }
+
+  @Provides
+  static SendEmailService provideSendEmailService() {
+    return new SendEmailService();
+  }
 }