Add endpoints for some finer control on minion tasks

[klsince]

add endpoints for some finer control on minion tasks:

• inspect the states or configs of the subtasks of a task
• allow to delete individual tasks w/o deleting the task queue

Release Notes

Added 3 http endpoints for inspecting and operating the minion tasks

• /tasks/subtask/{taskName}/state to get the states of the subtasks of a task
• /tasks/subtask/{taskName}/config to get the configs of the subtasks of a task
• /tasks/task/{taskName} to delete a task and all its subtasks

[codecov-commenter]

Codecov Report

Merging #8486 (16340f7) into master (6849441) will increase coverage by 41.46%.
The diff coverage is 12.50%.

@@              Coverage Diff              @@
##             master    #8486       +/-   ##
=============================================
+ Coverage     29.15%   70.61%   +41.46%     
- Complexity        0     4280     +4280     
=============================================
  Files          1660     1672       +12     
  Lines         87082    87476      +394     
  Branches      13194    13240       +46     
=============================================
+ Hits          25386    61770    +36384     
+ Misses        59367    21410    -37957     
- Partials       2329     4296     +1967     

Flag	Coverage Δ
integration1	27.03% <12.50%> (-0.04%)	⬇️
integration2	26.07% <0.00%> (+0.22%)	⬆️
unittests1	66.99% <ø> (?)
unittests2	14.11% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...roller/api/resources/PinotTaskRestletResource.java	0.00% <0.00%> (ø)
...lix/core/minion/PinotHelixTaskResourceManager.java	40.47% <13.88%> (-3.71%)	⬇️
...core/startree/operator/StarTreeFilterOperator.java	85.31% <0.00%> (-2.10%)	⬇️
...nction/DistinctCountBitmapAggregationFunction.java	47.66% <0.00%> (-2.08%)	⬇️
...r/helix/SegmentOnlineOfflineStateModelFactory.java	58.49% <0.00%> (-1.89%)	⬇️
...pache/pinot/core/query/utils/idset/EmptyIdSet.java	25.00% <0.00%> (ø)
...anager/realtime/SegmentBuildTimeLeaseExtender.java	63.23% <0.00%> (ø)
...in/stream/kafka20/KafkaPartitionLevelConsumer.java	66.66% <0.00%> (ø)
...ker/api/resources/BrokerEchoWithAutoDiscovery.java	0.00% <0.00%> (ø)
...pache/pinot/core/api/AutoLoadedServiceForTest.java	0.00% <0.00%> (ø)
... and 1160 more

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