[WIP] Pluggable fsm

[KKcorps]

DO NOT MERGE THIS

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.34146% with 138 lines in your changes missing coverage. Please review.

Project coverage is 64.09%. Comparing base (59551e4) to head (6d585f4). Report is 1463 commits behind head on master.

Files with missing lines	Patch %	Lines
...ix/core/realtime/BlockingSegmentCompletionFSM.java	67.53%	93 Missing and 19 partials :warning:
...lix/core/realtime/SegmentCompletionFSMFactory.java	43.75%	15 Missing and 3 partials :warning:
...r/helix/core/realtime/SegmentCompletionConfig.java	66.66%	3 Missing and 1 partial :warning:
.../helix/core/realtime/SegmentCompletionManager.java	78.94%	3 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #14088      +/-   ##
============================================
+ Coverage     61.75%   64.09%   +2.33%     
- Complexity      207     1600    +1393     
============================================
  Files          2436     2700     +264     
  Lines        133233   148703   +15470     
  Branches      20636    22781    +2145     
============================================
+ Hits          82274    95304   +13030     
- Misses        44911    46393    +1482     
- Partials       6048     7006     +958     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (+99.99%)	:arrow_up:
integration	100.00% <ø> (+99.99%)	:arrow_up:
integration1	100.00% <ø> (+99.99%)	:arrow_up:
integration2	0.00% <ø> (ø)
java-11	63.98% <66.34%> (+2.27%)	:arrow_up:
java-21	63.98% <66.34%> (+2.35%)	:arrow_up:
skip-bytebuffers-false	64.00% <66.34%> (+2.25%)	:arrow_up:
skip-bytebuffers-true	63.96% <66.34%> (+36.23%)	:arrow_up:
temurin	64.09% <66.34%> (+2.33%)	:arrow_up:
unittests	64.08% <66.34%> (+2.33%)	:arrow_up:
unittests1	56.27% <ø> (+9.38%)	:arrow_up:
unittests2	34.53% <66.34%> (+6.80%)	:arrow_up:

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