Add a flag to control auto-deploy behavior

[b4sjoo]

Description

This PR introduced a boolean flag to control auto-deploy behavior. This boolean is wrapped with a new flat object field in order to avoid adding to much field to model index directly in the future. To make model index cleaner and maintainable.

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Attention: Patch coverage is 46.07843% with 55 lines in your changes are missing coverage. Please review.

Project coverage is 81.30%. Comparing base (be56bcf) to head (abb2173).
Report is 2 commits behind head on main.

❗ Current head abb2173 differs from pull request most recent head 412fdd8. Consider uploading reports for the commit 412fdd8 to get more accurate results

Files	Patch %	Lines
...ommon/transport/register/MLRegisterModelInput.java	34.61%	8 Missing and 9 partials ⚠️
...ansport/upload_chunk/MLRegisterModelMetaInput.java	16.66%	6 Missing and 9 partials ⚠️
.../ml/common/transport/model/MLUpdateModelInput.java	18.75%	7 Missing and 6 partials ⚠️
...rc/main/java/org/opensearch/ml/common/MLModel.java	30.76%	6 Missing and 3 partials ⚠️
...ain/java/org/opensearch/ml/common/CommonValue.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2276      +/-   ##
============================================
- Coverage     81.42%   81.30%   -0.12%     
- Complexity     5853     5857       +4     
============================================
  Files           557      558       +1     
  Lines         23871    23952      +81     
  Branches       2493     2511      +18     
============================================
+ Hits          19436    19475      +39     
- Misses         3412     3441      +29     
- Partials       1023     1036      +13     

Flag	Coverage Δ
ml-commons	81.30% <46.07%> (-0.12%)	⬇️

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