Added Open API validator

[Jai0401]

Fixes #366
Added Open API validator using https://github.com/IBM/openapi-validator

[Jai0401]

@ravi-prakash-v Can you please review this PR?

[ravi-prakash-v]

@Jai0401 how to I test this? Can you add testing steps?

[ravi-prakash-v]

@Jai0401 could you please update your PR to validate the specification against Open API 3.1 specification? Refer to the latest release - version 1.1.1

[rajaneeshk90]

Hi @Jai0401 ,

Thank you for submitting the PR.

I’ve provided my comments inline for your reference.

Additionally, here are a few points to consider:

1. The workflow should also be triggered on the push events.
2. We can include the paths subsection inside the push and pull_request sections.
3. It’s a good idea to use the latest versions of these tools.
4. The specification files are now using OpenAPI 3.1. We should validate the files against OpenAPI 3.1 in the lint steps. i.erun: openapi lint api/meta/build/meta.yaml step.

Thanks,
Rajaneesh