Update organization of the unit tests

[nwlandry]

This PR does the following:

• Organizes the unit tests and files into two categories: HIF-compliant and HIF non-compliant. The unit tests are split into two files and the json files are put into two separate folders according to HIF compliance/non-compliance.
• Organizes conftest.py and the unit test files roughly in these categories: top-level attributes, metadata, nodes, edges, and incidences.
• Format the JSON files consistently (And the schema) with VSCode formatter (https://www.geeksforgeeks.org/how-to-format-json-in-vscode/)
• Adds several unit tests to the test suite
• Tweaks the README and License files.
• Tweaks the schema because it was not catching extraneous fields in the incidence records

[nwlandry]

Hi @colltoaction and @FraLotito --- would really appreciate your thoughts on these changes! I reorganized the unit tests to make them easier to contribute to.

[FraLotito]

Thanks @nwlandry! I'll check it out in the following days

[colltoaction]

I'm wondering if we can remove some duplication like return json.load... but I don't see any pytest feature to aid with this.

WRT formatting it would be good to understand what this formatter is doing but it's fine with me. An external formatter / linter could be ran in Actions for guardrailing.

Thank you!

[FraLotito]

Ok I agree with this structure, I think the changes improve the readability and organization of the tests. Thanks @nwlandry !

[nwlandry]

I'm wondering if we can remove some duplication like return json.load... but I don't see any pytest feature to aid with this.

WRT formatting it would be good to understand what this formatter is doing but it's fine with me. An external formatter / linter could be ran in Actions for guardrailing.

Thank you!

Good point! I'll see what's out there.

[nwlandry]

@FraLotito and @colltoaction, thanks for reviewing!!