HDDS-12436. [DiskBalancer] Add metrics for time spent by container move

[Gargi-jais11]

What changes were proposed in this pull request?

Add metrics in DiskBalancerServiceMetrics to record the time spent on container move, for both success and failure case.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-12436

How was this patch tested?

The patch was tested manually by running docker cluster and seeing the results at JMX endpoint and prometheus. At prometheus endpoint by querying for disk_balancer_service_metrics_move_success_time_avg_time and disk_balancer_service_metrics_move_failure_time_avg_time it shows the change in graph curves and the average time taken for the successful and failure moves respectively.

"name" : "Hadoop:service=HddsDatanode,name=DiskBalancerServiceMetrics",
    "modelerType" : "DiskBalancerServiceMetrics",
    "tag.Context" : "dfs",
    "tag.Hostname" : "2757e35f9c78",
    "FailureCount" : 6,
    "IdleLoopExceedsBandwidthCount" : 0,
    "IdleLoopNoAvailableVolumePairCount" : 0,
    "MoveFailureTimeNumOps" : 6,
    "MoveFailureTimeAvgTime" : 0.0,
    "MoveSuccessTimeNumOps" : 7,
    "MoveSuccessTimeAvgTime" : 0.0,
    "RunningLoopCount" : 10,
    "SuccessBytes" : 10412359680,
    "SuccessCount" : 7

[ivandika3]

@Gargi-jais11 Thanks for the patch. Left some comments.

[ivandika3]

Thanks for the update. Just left few more nits.

[ivandika3]

Thanks for the update. LGTM +1.

[ivandika3]

@Gargi-jais11 Thanks for the patch.