postman: Add automation support

[VitikaSoni]

Checklist

• [x] Update help
• [x] Update changelog
• [x] Run ./gradlew spotlessApply for code formatting
• [x] Write tests
• [x] Check code coverage
• [x] Sign-off commits
• [x] Squash commits
• [x] Use a descriptive title

[kingthorin]

@VitikaSoni are you planning to finish this?

[github-actions[bot]]

CLA Assistant Lite bot:
Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

_{You can retrigger this bot by commenting recheck in this Pull Request}

[thc202]

Thank you!