Dispatcher stats and job logs

This provides the stats from AUX dispatcher and non-IO dispatcher, and from all the reader and writer threads running for the specific bucket. Along with stats, the job logs for each of the dispatchers and worker threads is also made available.

The following stats are available for the workers and dispatchers:

Stat Description
state Threads’s current status: running, sleeping etc.
runtime The amount of time since the thread started running
task The activity/job the thread is involved with at the moment

The following stats are for individual job logs:

Stat Description
starttime The timestamp when the job started
runtime Time it took for the job to run
task The activity/job the thread ran during that time