Support mapping alias for maintainer-activity indices

[Divyaasm]

Description

Add alias to index if requested , onboarded alias creation for maintainer-activity indices.

Issues Resolved

#120

Pending test

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[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.04%. Comparing base (bcb0693) to head (516982d).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...ava/org/opensearchmetrics/util/OpenSearchUtil.java	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #124      +/-   ##
============================================
+ Coverage     87.00%   87.04%   +0.03%     
  Complexity      334      334              
============================================
  Files            74       74              
  Lines          1924     1937      +13     
  Branches         85       86       +1     
============================================
+ Hits           1674     1686      +12     
  Misses          211      211              
- Partials         39       40       +1     

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