feat: enable support to define elasticsearch serverless

[Blankll]

feat: enable support to define Elasticsearch serverless

Refs: #12

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.79%. Comparing base (8c925cf) to head (0441a7b).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/stack/iacStack.ts	91.66%	0 Missing and 1 partial ⚠️
src/stack/parse.ts	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage   75.17%   76.79%   +1.62%     
==========================================
  Files          19       19              
  Lines         286      306      +20     
  Branches       43       47       +4     
==========================================
+ Hits          215      235      +20     
+ Misses         64       62       -2     
- Partials        7        9       +2     

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