add text docs ML input

[ylwu-amzn]

Description

Add text docs ML input.

Before this PR

POST /_plugins/_ml/models/<model_id>/_predict
{
    "text_docs": ["today is sunny"],
    "return_number": true,
    "target_response": ["sentence_embedding"]
}

After

POST /_plugins/_ml/models/<model_id>/_predict
{
    "text_docs": ["today is sunny"],
    "result_filter": {
        "return_number": true,
        "target_response": ["sentence_embedding"]
    }
}

Issues Resolved

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #830 (2cde7d6) into 2.x (b5ac338) will not change coverage.
The diff coverage is n/a.

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@@            Coverage Diff            @@
##                2.x     #830   +/-   ##
=========================================
  Coverage     84.81%   84.81%           
  Complexity     1628     1628           
=========================================
  Files           135      135           
  Lines          6080     6080           
  Branches        596      596           
=========================================
  Hits           5157     5157           
  Misses          666      666           
  Partials        257      257           

Flag	Coverage Δ
ml-commons	84.81% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...a/org/opensearch/ml/engine/algorithms/DLModel.java	85.43% <ø> (ø)

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