feat(api): integrate OpenAPI client generator for frontend

[jimmypalelil]

Description

• Add OpenAPI CLI generator dependency for TypeScript-Axios library
• Implement resource entity fetching with generated client
• Update DTO types in NestJS server
• Add client library generation instructions to README

Fixes # (issue) N/A

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Modified tests in frontend

Checklist

• I have read the [CONTRIBUTING](https://www.notion.so/CONTRIBUTING.md) doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

[marcellmueller]

This is amazing! Really solid first PR, I think Om is going to add this to Quickstart Openshift when he has time.

Something to consider for the future is a check in CI to compare the frontend and backend and ensure the client has been generated on the frontend before submitting pr for review.

Looks like Sonarcloud is complaining about test coverage, let me know if you have any issues with that thanks!

[mishraomp]

This is cool work, would love to steal it @jimmypalelil
cc @DerekRoberts @marcellmueller