Prompt Management GET API

[rcho93]

Description

Implements an API to retrieve a prompt

Related Issues

Resolves #3711

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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[codecov]

Codecov Report

Attention: Patch coverage is 98.36066% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.22%. Comparing base (9351e2e) to head (6e1538a).

Files with missing lines	Patch %	Lines
...java/org/opensearch/ml/prompt/MLPromptManager.java	94.11%	2 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##             feature/prompt    #3846      +/-   ##
====================================================
+ Coverage             78.15%   78.22%   +0.06%     
- Complexity             7399     7435      +36     
====================================================
  Files                   662      668       +6     
  Lines                 33345    33458     +113     
  Branches               3738     3738              
====================================================
+ Hits                  26060    26171     +111     
- Misses                 5689     5691       +2     
  Partials               1596     1596              

Flag	Coverage Δ
ml-commons	78.22% <98.36%> (+0.06%)	⬆️

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