Add composite directory factory

[rayshrey]

Description

Adds CompositeDirectoryFactory and makes it pluggable so that plugins can utilize this and implement their own composite directory factory.

Related Issues

Resolves #[17982]

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 28db81c: FAILURE

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❌ Gradle check result for a3659ed: FAILURE

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❌ Gradle check result for cf76756: FAILURE

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❌ Gradle check result for 5e356c0: FAILURE

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[github-actions]

❕ Gradle check result for 158155c: UNSTABLE

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[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 8 lines in your changes missing coverage. Please review.

Project coverage is 72.51%. Comparing base (6ce0628) to head (73d7ae3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
server/src/main/java/org/opensearch/node/Node.java	69.23%	4 Missing ⚠️
...rc/main/java/org/opensearch/index/IndexModule.java	76.92%	1 Missing and 2 partials ⚠️
...c/main/java/org/opensearch/index/IndexService.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17988      +/-   ##
============================================
- Coverage     72.61%   72.51%   -0.11%     
+ Complexity    67203    67143      -60     
============================================
  Files          5473     5474       +1     
  Lines        310145   310178      +33     
  Branches      45064    45066       +2     
============================================
- Hits         225225   224925     -300     
- Misses        66576    66877     +301     
- Partials      18344    18376      +32     

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[github-actions]

❌ Gradle check result for 6b5e93a: FAILURE

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[github-actions]

❕ Gradle check result for 47c5504: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[gbbafna]

Lets add changelog as well .

[github-actions]

❕ Gradle check result for 8460f19: UNSTABLE

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❕ Gradle check result for c5ad429: UNSTABLE

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❌ Gradle check result for a5f0daf: FAILURE

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❌ Gradle check result for 012b35d: FAILURE

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[github-actions]

✅ Gradle check result for 73d7ae3: SUCCESS