chore: ignore openapi autogenerated hidden files

[sbansla]

Fixes

A short description of what this PR does.
open api generates hidden files: ".openapi-generator" and ".openapi-generator-ignore". Ignoring these files on commit.

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
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• I have added tests that prove my fix is effective or that my feature works
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• I have added inline documentation to the code I modified

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