Adding perf benchmark logic for GroupIdGenerator hash map

[shauryachats]

This PR adds performance benchmarking logic to identify and measure the improvement of different strategies for hash map selection, to make a data-driven choice on the hash map used to power GroupIdGenerator, which has been described in the issue #14685.

The results of this benchmark are:

Benchmark                                                 (_cardinality)  Mode  Cnt     Score     Error  Units              
BenchmarkObjectOpenHashMap.object2IntOpenHashMap                  500000  avgt   20   111.262 ±   5.448  ms/op              
BenchmarkObjectOpenHashMap.object2IntOpenHashMap                 1000000  avgt   20   299.255 ±   9.814  ms/op              
BenchmarkObjectOpenHashMap.object2IntOpenHashMap                 5000000  avgt   20  1859.503 ±  58.990  ms/op              
BenchmarkObjectOpenHashMap.object2IntOpenHashMap                20000000  avgt   20  8236.525 ± 170.751  ms/op      
        
BenchmarkObjectOpenHashMap.object2IntReservedOpenHashMap          500000  avgt   20    79.908 ±   4.715  ms/op              
BenchmarkObjectOpenHashMap.object2IntReservedOpenHashMap         1000000  avgt   20   180.827 ±  19.987  ms/op              
BenchmarkObjectOpenHashMap.object2IntReservedOpenHashMap         5000000  avgt   20  1051.368 ±  49.204  ms/op              
BenchmarkObjectOpenHashMap.object2IntReservedOpenHashMap        20000000  avgt   20  3340.668 ± 106.874  ms/op 
             
BenchmarkObjectOpenHashMap.vanillaHashMap                         500000  avgt   20   109.589 ±   2.836  ms/op              
BenchmarkObjectOpenHashMap.vanillaHashMap                        1000000  avgt   20   265.262 ±   5.215  ms/op              
BenchmarkObjectOpenHashMap.vanillaHashMap                        5000000  avgt   20  1556.399 ±  49.787  ms/op              
BenchmarkObjectOpenHashMap.vanillaHashMap                       20000000  avgt   20  6757.234 ± 314.138  ms/op     
         
BenchmarkObjectOpenHashMap.vanillaReservedHashMap                 500000  avgt   20    98.798 ±   4.344  ms/op              
BenchmarkObjectOpenHashMap.vanillaReservedHashMap                1000000  avgt   20   228.480 ±   6.570  ms/op              
BenchmarkObjectOpenHashMap.vanillaReservedHashMap                5000000  avgt   20  1067.580 ±  48.764  ms/op              
BenchmarkObjectOpenHashMap.vanillaReservedHashMap               20000000  avgt   20  4725.897 ± 284.449  ms/op    

which yields that the reserved hashmap performs ~2.5x better than the current unreserved hashmap, which led to the following PR: #14981.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.68%. Comparing base (59551e4) to head (6e70a53).
Report is 1673 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #14992      +/-   ##
============================================
+ Coverage     61.75%   63.68%   +1.93%     
- Complexity      207     1480    +1273     
============================================
  Files          2436     2713     +277     
  Lines        133233   152171   +18938     
  Branches      20636    23526    +2890     
============================================
+ Hits          82274    96912   +14638     
- Misses        44911    47969    +3058     
- Partials       6048     7290    +1242     

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	63.66% <ø> (+1.95%)	⬆️
java-21	63.56% <ø> (+1.94%)	⬆️
skip-bytebuffers-false	63.67% <ø> (+1.92%)	⬆️
skip-bytebuffers-true	63.55% <ø> (+35.82%)	⬆️
temurin	63.68% <ø> (+1.93%)	⬆️
unittests	63.68% <ø> (+1.93%)	⬆️
unittests1	56.23% <ø> (+9.34%)	⬆️
unittests2	34.02% <ø> (+6.28%)	⬆️

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