Adds push-based-ingestion plugin POC

[gviedma]

This PR adds a proof-of-concept for a push-based ingestion API by:

• Creating an in-memory ring buffer to store ingested records
• Creating a new consumer type that reads from in-memory buffer
• Starting a new HTTP server endpoint embedded in the pinot-server to push records to in-memory buffer.

To push records to the new end-point, you can use curl like so:

curl --header 'Content-Type: application/octet-stream' --data @/Users/genunez/dev/oss/pinot/pinot-tools/src/main/resources/examples/stream/pushBasedIngestionDemo/rawdata/pushBasedIngestionDemo_data.json http://localhost:8989/ingestion/records/${tableName}

where tableName is that table you are pushing records to.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.75%. Comparing base (59551e4) to head (baf7f84).
Report is 1598 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #14851      +/-   ##
============================================
+ Coverage     61.75%   63.75%   +2.00%     
- Complexity      207     1611    +1404     
============================================
  Files          2436     2708     +272     
  Lines        133233   151293   +18060     
  Branches      20636    23357    +2721     
============================================
+ Hits          82274    96455   +14181     
- Misses        44911    47590    +2679     
- Partials       6048     7248    +1200     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (+99.99%)	⬆️
integration	100.00% <ø> (+99.99%)	⬆️
integration1	100.00% <ø> (+99.99%)	⬆️
integration2	0.00% <ø> (ø)
java-11	63.73% <ø> (+2.02%)	⬆️
java-21	63.61% <ø> (+1.98%)	⬆️
skip-bytebuffers-false	63.74% <ø> (+2.00%)	⬆️
skip-bytebuffers-true	63.59% <ø> (+35.86%)	⬆️
temurin	63.75% <ø> (+2.00%)	⬆️
unittests	63.74% <ø> (+2.00%)	⬆️
unittests1	56.29% <ø> (+9.40%)	⬆️
unittests2	34.06% <ø> (+6.32%)	⬆️

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