add more testing for MV var-length columns, detect overflow scenarios

[richardstartin]

This addresses a bug report of a buffer overflow creating MV string raw forward index, with the following stack trace:

Start building IndexCreator!
Could not build segment
java.lang.IllegalArgumentException: newPosition > limit: (1048580 > 1048575)
	at java.nio.Buffer.createPositionException(Buffer.java:318) ~[?:?]
	at java.nio.Buffer.position(Buffer.java:293) ~[?:?]
	at java.nio.ByteBuffer.position(ByteBuffer.java:1094) ~[?:?]
	at java.nio.MappedByteBuffer.position(MappedByteBuffer.java:226) ~[?:?]
	at java.nio.MappedByteBuffer.position(MappedByteBuffer.java:67) ~[?:?]
	at org.apache.pinot.segment.local.io.writer.impl.VarByteChunkSVForwardIndexWriter.putStrings(VarByteChunkSVForwardIndexWriter.java:119) ~[pinot-all-0.10.0-SNAPSHOT-jar-with-dependencies.jar:0.10.0-SNAPSHOT-bb98ed89e7e2f06138139f58ec0ec6d4f9944a16]
	at org.apache.pinot.segment.local.segment.creator.impl.fwd.MultiValueVarByteRawIndexCreator.putStringMV(MultiValueVarByteRawIndexCreator.java:106) ~[pinot-all-0.10.0-SNAPSHOT-jar-with-dependencies.jar:0.10.0-SNAPSHOT-bb98ed89e7e2f06138139f58ec0ec6d4f9944a16]
	at org.apache.pinot.segment.local.segment.creator.impl.SegmentColumnarIndexCreator.indexRow(SegmentColumnarIndexCreator.java:543) ~[pinot-all-0.10.0-SNAPSHOT-jar-with-dependencies.jar:0.10.0-SNAPSHOT-bb98ed89e7e2f06138139f58ec0ec6d4f9944a16]
	at org.apache.pinot.segment.local.segment.creator.impl.SegmentIndexCreationDriverImpl.build(SegmentIndexCreationDriverImpl.java:244) ~[pinot-all-0.10.0-SNAPSHOT-jar-with-dependencies.jar:0.10.0-SNAPSHOT-bb98ed89e7e2f06138139f58ec0ec6d4f9944a16]
	at org.apache.pinot.segment.local.realtime.converter.RealtimeSegmentConverter.build(RealtimeSegmentConverter.java:131) ~[pinot-all-0.10.0-SNAPSHOT-jar-with-dependencies.jar:0.10.0-SNAPSHOT-bb98ed89e7e2f06138139f58ec0ec6d4f9944a16]
	at org.apache.pinot.core.data.manager.realtime.LLRealtimeSegmentDataManager.buildSegmentInternal(LLRealtimeSegmentDataManager.java:815) [pinot-all-0.10.0-SNAPSHOT-jar-with-dependencies.jar:0.10.0-SNAPSHOT-bb98ed89e7e2f06138139f58ec0ec6d4f9944a16]
	at org.apache.pinot.core.data.manager.realtime.LLRealtimeSegmentDataManager.buildSegmentForCommit(LLRealtimeSegmentDataManager.java:746) [pinot-all-0.10.0-SNAPSHOT-jar-with-dependencies.jar:0.10.0-SNAPSHOT-bb98ed89e7e2f06138139f58ec0ec6d4f9944a16]
	at org.apache.pinot.core.data.manager.realtime.LLRealtimeSegmentDataManager$PartitionConsumer.run(LLRealtimeSegmentDataManager.java:644) [pinot-all-0.10.0-SNAPSHOT-jar-with-dependencies.jar:0.10.0-SNAPSHOT-bb98ed89e7e2f06138139f58ec0ec6d4f9944a16]
	at java.lang.Thread.run(Thread.java:829) [?:?]

I have added extensive testing for the impacted components and could not find any buffer overflows, and have narrowed this down to an integer overflow such that the product of Integer.BYTES + maxRowLengthInBytes + maxLengthPrefixes and a fixed numDocsPerChunk overflows and is non-negative. Very large MV values is a limitation of the current implementation and I have added precondition checks to detect overflow unambiguously.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.77%. Comparing base (e498a71) to head (e32266e).
⚠️ Report is 6312 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #8286      +/-   ##
============================================
- Coverage     70.82%   70.77%   -0.05%     
- Complexity     4239     4243       +4     
============================================
  Files          1631     1631              
  Lines         85461    85463       +2     
  Branches      12877    12879       +2     
============================================
- Hits          60527    60486      -41     
- Misses        20749    20804      +55     
+ Partials       4185     4173      -12     

Flag	Coverage Δ
integration1	28.88% <0.00%> (-0.11%)	⬇️
integration2	27.58% <0.00%> (-0.02%)	⬇️
unittests1	66.92% <100.00%> (+<0.01%)	⬆️
unittests2	14.16% <0.00%> (-0.01%)	⬇️

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