[Manual backport 3.3] Nova mme support

[nathaliellenaa]

Description

Manual backport of this PR #4360 to 3.3

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[nathaliellenaa]

Failing tests due to throttling

REPRODUCE WITH: gradlew ':opensearch-ml-plugin:integTest' --tests 'org.opensearch.ml.rest.RestMLRAGSearchProcessorIT.testBM25WithBedrockConverseUsingLlmMessages' -Dtests.seed=7FCE922E2078C4E7 -Dtests.security.manager=false -Dtests.locale=ksh-Latn-DE -Dtests.timezone=Europe/Paris -Druntime.java=21
    REPRODUCE WITH: gradlew ':opensearch-ml-plugin:integTest' --tests 'org.opensearch.ml.rest.RestMLRAGSearchProcessorIT.testBM25WithBedrockConverseUsingLlmMessages' -Dtests.seed=7FCE922E2078C4E7 -Dtests.security.manager=false -Dtests.locale=ksh-Latn-DE -Dtests.timezone=Europe/Paris -Druntime.java=21

RestMLRAGSearchProcessorIT > testBM25WithBedrockConverseUsingLlmMessages FAILED
    org.opensearch.client.ResponseException: method [POST], host [http://[::1]:59375], URI [/test/_search?size=5&search_pipeline=pipeline_test], status line [HTTP/1.1 429 Too Many Requests]
    {"error":{"root_cause":[{"type":"remote_connector_throttling_exception","reason":"Error from remote service: The request was denied due to remote server throttling. To change the retry policy and behavior, please update the connector client_config."}],"type":"remote_connector_throttling_exception","reason":"Error from remote service: The request was denied due to remote server throttling. To change the retry policy and behavior, please update the connector client_config."},"status":429}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.10%. Comparing base (0bfaf7b) to head (c21d5d0).
⚠️ Report is 5 commits behind head on 3.3.

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3    #4368      +/-   ##
============================================
+ Coverage     80.08%   80.10%   +0.01%     
- Complexity    10191    10204      +13     
============================================
  Files           855      858       +3     
  Lines         44373    44458      +85     
  Branches       5135     5139       +4     
============================================
+ Hits          35536    35611      +75     
- Misses         6671     6681      +10     
  Partials       2166     2166              

Flag	Coverage Δ
ml-commons	80.10% <100.00%> (+0.01%)	⬆️

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