Add postman import spec

[ll931217]

This PR focuses on having the Postman Collection import functionality. The following is how one can use this functionality:

Flags

Flag	Values	Description
-t/--type	openapi, postman	Pick which API spec to import
-o/--output		Select the directory to output the generated posting requests and variables. If this isn't supplied then the directories and request files will be created where the spec_file is located.

Usage:

posting -t postman postman.collection.json

posting -t postman -o requests postman.collection.json

I wrote a test for it but I am not sure how to include it in the test workflow, the test passes when I run

uv run pytest -d tests/test_postman_import.py

NOTE: I have tested it with Postman API Collection and my company's postman collection, seems to all work.

[darrenburns]

Thanks for this very important feature! I'm on a break at the moment but will try to take this for a spin within the next couple of weeks.

[darrenburns]

Pushed a fix for a crash I got when I downloaded a sample Postman collection - PostmanCollection.info and PostmanCollection.variable were optional.

Also from testing it seems like the directory structure is not being respected?

[ll931217]

Pushed a fix for a crash I got when I downloaded a sample Postman collection - PostmanCollection.info and PostmanCollection.variable were optional.

Also from testing it seems like the directory structure is not being respected?

Sorry been quite busy lately, will work on this when I get time