Revert "Removed Logging in DefaultEventHandler.scala file"

This reverts commit e05de6c57a2ba249421dd91d2296e86ee66c3006.
Revert "In producer.async.DefaultEventHandler, producerStats and producerTopicStats are causing problem. So line 49 and 50 are removed"

This reverts commit 313bb4093e83ed9449df2cf53c1b7bcc380f33f4.
Made changes, Now FailedtoSend error is coming bcoz metric.core is rejected
All these changes were made to remove kafka failed to send after 3 tries error. Noluck