Allow Import actions from Postman collections

### Is your proposal related to a problem?

I have an API spec defined on postman, would be nice if I can import APIs to Hasura directly from this.

### Describe alternatives you've considered

Right now it is a manual process and takes more time to connect REST endpoints as actions.

The issue names Postman collections, Hasura, and REST endpoints represented as actions, but provides no files, tests, or entry points. Start by locating the existing action-creation flow and any Postman collection handling, then define how collection requests map to actions. Done means APIs from a Postman collection can be imported without manually recreating each REST action.

Written by the indexing model from the issue text.