Add a builder to ingestion source

[yupeng9]

Description

As IngestionSource takes more arguments, it's better to change the constructor to a builder pattern

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[github-actions]

❌ Gradle check result for 3dd7845: 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 3dd7845: 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.

[codecov]

Codecov Report

Attention: Patch coverage is 65.21739% with 8 lines in your changes missing coverage. Please review.

Project coverage is 72.41%. Comparing base (2d42bd0) to head (3dd7845).
Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
...g/opensearch/cluster/metadata/IngestionSource.java	57.89%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17814      +/-   ##
============================================
+ Coverage     72.39%   72.41%   +0.02%     
- Complexity    66066    66299     +233     
============================================
  Files          5358     5384      +26     
  Lines        306500   307164     +664     
  Branches      44409    44555     +146     
============================================
+ Hits         221888   222441     +553     
- Misses        66474    66575     +101     
- Partials      18138    18148      +10     

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[mch2]

lgtm