Local Microservice for CheckList in Explainability api

[KhanhThiVo]

What does this PR do?

Before submitting / marking as 'ready to review'

• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [ ] Did you make sure to update the documentation with your changes?
• [ ] Did you write any new necessary tests?

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[Rachneet]

To answer @timbmg, dockerization and integration to CI/CD is not in the scope of this task. But the code should follow the structure of all the other services such that dockerization can be done in a consistent and smooth manner.