spike: Change Approval API

[fundthmcalculus]

This is definitely a work in progress, but I have been able to start reverse-engineering the Change Approval board API. It clearly runs on the changeapproval cookie, which I need to figure out how to extract more intelligently (since it expires every day). That being said, I have successfully extracted a (test) change approval by ID and confirmed the contents.

I'll keep working on this, extending the endpoints as I can figure them out - it uses a different API structure, but I have a python script written which can convert the JSON object from Chrome Developer console into python (pydantic) models. It's a 95% solution (doesn't know import ordering, occasionally gets a type wrong, etc), but it's pretty handy. If interested, I can include it too.

Here is an example (with a number of IDs, and coworker details censored):

[fundthmcalculus]

@Yoshify I'd appreciate some thoughts on this:

1. General direction - is this something we want to support?
2. Architecture - the Change Approvals module has a different API, so I was trying to make this look familiar to the rest of the api.
3. Anything else - I added tests for my environment to confirm functionality.