Provide factory for pluggable deciders

[Gankris96]

Description

Follow up of #15363
Modify the way plugins can provide deciders.
Provide a factory that plugins can implement to create decider objects.

Related Issues

Resolves #15259

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for b58f018: FAILURE

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[github-actions]

❌ Gradle check result for 0093c65: FAILURE

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[github-actions]

❌ Gradle check result for 154fb6f: FAILURE

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[github-actions]

❌ Gradle check result for 154fb6f: FAILURE

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[sohami]

❌ Gradle check result for 154fb6f: FAILURE

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Looks to be some issue on main. gradle check on other PRs are also failing with same error

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':distribution:bwc:minor:buildBwcLinuxTar'.
> Building 2.17.0 didn't generate expected file /var/jenkins/workspace/gradle-check/search/distribution/bwc/minor/build/bwc/checkout-2.x/distribution/archives/linux-tar/build/distributions/opensearch-min-2.17.0-SNAPSHOT-linux-x64.tar.gz

[github-actions]

❌ Gradle check result for 154fb6f: FAILURE

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[github-actions]

❌ Gradle check result for 154fb6f: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 5057ab1: FAILURE

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[github-actions]

✅ Gradle check result for 5b2e58b: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.85%. Comparing base (729e40d) to head (5b2e58b).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
...earch/deciders/ConcurrentSearchRequestDecider.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #15713      +/-   ##
============================================
- Coverage     71.95%   71.85%   -0.11%     
+ Complexity    64192    64113      -79     
============================================
  Files          5270     5271       +1     
  Lines        300052   300169     +117     
  Branches      43368    43380      +12     
============================================
- Hits         215917   215685     -232     
- Misses        66442    66762     +320     
- Partials      17693    17722      +29     

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