Add new broker query point for querying multi-stage engine

[xiangfu0]

Per #11251 , create two new Broker API endpoints for multi-stage query engine.

GET /query
POST /query

Make Integration tests to use new endpoint for testing multi-stage engine.

[Jackie-Jiang]

Seems there is a bug in MultiStageBrokerRequestHandler where it uses TRACE in the json request instead of the query options. We should use the one in query options instead. RequestUtils.setOptions() already set the one in json request into the query options.
Other than that, LGTM

[codecov-commenter]

Codecov Report

Merging #11341 (f24e48c) into master (f25f3ed) will decrease coverage by 0.16%.
Report is 2 commits behind head on master.
The diff coverage is 39.58%.

@@             Coverage Diff              @@
##             master   #11341      +/-   ##
============================================
- Coverage     68.46%   68.31%   -0.16%     
+ Complexity     6535     6532       -3     
============================================
  Files          2233     2233              
  Lines        119952   119971      +19     
  Branches      18191    18191              
============================================
- Hits          82128    81955     -173     
- Misses        31984    32171     +187     
- Partials       5840     5845       +5     

Flag	Coverage Δ
integration1	20.86% <37.50%> (-0.13%)	⬇️
integration2	25.63% <39.58%> (-0.03%)	⬇️
java-11	33.92% <39.58%> (-34.49%)	⬇️
java-17	67.69% <39.58%> (-0.61%)	⬇️
java-20	65.86% <37.50%> (-2.44%)	⬇️
temurin	68.31% <39.58%> (-0.16%)	⬇️
unittests1	67.10% <ø> (-0.22%)	⬇️
unittests2	14.65% <8.33%> (-0.01%)	⬇️

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

Files Changed	Coverage Δ
...pinot/broker/api/resources/PinotClientRequest.java	40.18% <27.27%> (-5.76%)	⬇️
...inot/client/JsonAsyncHttpPinotClientTransport.java	51.61% <58.33%> (+9.50%)	⬆️
...requesthandler/MultiStageBrokerRequestHandler.java	69.23% <100.00%> (+0.52%)	⬆️
...ient/JsonAsyncHttpPinotClientTransportFactory.java	75.00% <100.00%> (+0.64%)	⬆️

... and 31 files with indirect coverage changes

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[Jackie-Jiang]

Please add these new APIs to the pinot doc