Switch to cascading deletes in the DB layer where possible.

Author: EricWittmann

app/src/main/java/io/apicurio/registry/storage/RegistryStorage.java

@@ -568,7 +568,7 @@ void updateArtifactRule(String groupId, String artifactId, RuleType rule, RuleCo
     void updateGroupMetaData(GroupMetaDataDto group) throws GroupNotFoundException, RegistryStorageException;
 
     /**
-     * Deletes a group intified by the given groupId and DELETES ALL resources related to this group
+     * Deletes a group identified by the given groupId and DELETES ALL resources related to this group
      *
      * @param groupId (optional)
      * @throws GroupNotFoundException