[client] KUDU-3365: Expose INSERT/UPDATE metrics in the Java API

The work done in the scope of KUDU-3351 included the server-side changes
and corresponding changes in the Kudu C++ API to expose the metrics to
the client applications. This patch implement similar changes to expose
such metrics in Java client API.

Change-Id: I956eb0c0a2cadcf3491550630b861bb48462e8eb
Reviewed-on: http://gerrit.cloudera.org:8080/18489
Tested-by: Kudu Jenkins
Reviewed-by: Alexey Serbin <alexey@apache.org>
9 files changed