Adding Druid Extension for HLL Support (#1575)

Author: Shakthieshwari

ansible/roles/analytics-druid/defaults/main.yml

@@ -33,7 +33,7 @@ druid_request_logging_type: "file"
 
 druid_storage_type: "azure"
 
-druid_extensions_list : '"druid-azure-extensions", "graphite-emitter", "postgresql-metadata-storage", "druid-kafka-indexing-service"'
+druid_extensions_list : '"druid-azure-extensions", "graphite-emitter", "postgresql-metadata-storage", "druid-kafka-indexing-service", "druid-datasketches"'
 
 druid_community_extensions:
   - graphite-emitter