Add GenerateSpec11Action and SafeBrowsing evaluation

This adds actual subdomain verification via the SafeBrowsing API to the Spec11
pipeline, as well as on-the-fly KMS decryption via the GenerateSpec11Action to
securely store our API key in source code.

Testing the interaction becomes difficult due to serialization requirements, and will be significantly expanded in the next cl. For now, it verifies basic end-to-end pipeline behavior.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=208092942

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

@@ -107,6 +107,14 @@
     <url-pattern>/_dr/task/icannReportingUpload</url-pattern>
   </servlet-mapping>
 
+  <!--
+    Generates the Spec11 report for the month, storing it on GCS.
+  -->
+  <servlet-mapping>
+    <servlet-name>backend-servlet</servlet-name>
+    <url-pattern>/_dr/task/generateSpec11</url-pattern>
+  </servlet-mapping>
+
   <!-- Trademark Clearinghouse -->
 
   <!-- Downloads TMCH DNL data from MarksDB. -->