Extract Pinot Broker Endpoints with interfaces

[dongxiaoman]

Description

We extract the endpoints of Pinot Broker into public interfaces so it will have full compatibility in future.
It is a plain refactor of putting all endpoints into interface.

It is side to side with #8852

Tests done

QuickStart and open UI

[codecov-commenter]

Codecov Report

Merging #8876 (0c31c84) into master (754e807) will decrease coverage by 1.55%.
The diff coverage is 40.00%.

@@             Coverage Diff              @@
##             master    #8876      +/-   ##
============================================
- Coverage     69.65%   68.10%   -1.56%     
- Complexity     4679     4680       +1     
============================================
  Files          1806     1806              
  Lines         94201    94201              
  Branches      14050    14050              
============================================
- Hits          65620    64157    -1463     
- Misses        24021    25548    +1527     
+ Partials       4560     4496      -64     

Flag	Coverage Δ
integration1	?
integration2	24.76% <40.00%> (-0.08%)	⬇️
unittests1	66.37% <ø> (-0.01%)	⬇️
unittests2	15.42% <0.00%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
...ot/broker/api/resources/PinotBrokerAppConfigs.java	0.00% <0.00%> (ø)
...t/broker/api/resources/PinotBrokerHealthCheck.java	0.00% <0.00%> (ø)
...pinot/broker/api/resources/PinotBrokerRouting.java	0.00% <0.00%> (ø)
...e/pinot/broker/api/resources/PinotBrokerDebug.java	85.71% <100.00%> (ø)
...pinot/broker/api/resources/PinotClientRequest.java	50.94% <100.00%> (-7.55%)	⬇️
...pinot/minion/exception/TaskCancelledException.java	0.00% <0.00%> (-100.00%)	⬇️
...nverttorawindex/ConvertToRawIndexTaskExecutor.java	0.00% <0.00%> (-100.00%)	⬇️
...e/pinot/common/minion/MergeRollupTaskMetadata.java	0.00% <0.00%> (-94.74%)	⬇️
...plugin/segmentuploader/SegmentUploaderDefault.java	0.00% <0.00%> (-87.10%)	⬇️
.../transform/function/MapValueTransformFunction.java	0.00% <0.00%> (-85.30%)	⬇️
... and 145 more

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