Enhanced existing API generator to use the OpenAPI spec as the input format

[saimedhi]

Description

Enhanced existing API generator to use the OpenAPI spec as the input format

Issues Resolved

Closes #348

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[codecov-commenter]

Codecov Report

Merging #376 (88b97a6) into main (83be2cd) will increase coverage by 1.28%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main     #376      +/-   ##
==========================================
+ Coverage   70.72%   72.01%   +1.28%     
==========================================
  Files          77       77              
  Lines        7157     7190      +33     
==========================================
+ Hits         5062     5178     +116     
+ Misses       2095     2012      -83     

see 29 files with indirect coverage changes

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[VachaShah]

Thank you @saimedhi!

For the implementation of the generator, lets not add the specs to the client. The generator should use the specs from the opensearch-api-specification repo. See opensearch-project/opensearch-api-specification#74

[dblock]

+1 for not checking in spec files and importing them, otherwise looks good!

[nhtruong]

@VachaShah The OpenAPI specs on opensearch-api-specification repo currently doesn't have the extra metadata needed for generate the client code. This PR and its follow-up will have to be merged first before we can use the specs there for client generation.