Add generated catalogue models

[michpohl]

This adds generated catalogue code made using openapi-generator-clifrom our catalog API endpoint definitions.
Only the generated models have been added so far. Generated helper class have issues with maitaining compatibility with Android SDKs <26, so I left them out for now.

This is a temporary version intended for prototyping. It will be subject to change.
The generated code has a few small issues, but if you're looking to use just the types, you'll be fine.

This also adds catalogue-openapi.json, our current state of the ASPI definition,
and openapi-config.yml, specifying the generator-specific args used for generation.
This was the actual command used, from SDK root:

openapi-generator generate -i catalogue/catalogue_openapi.json -g kotlin -o ./catalogue/ -c catalogue/openapi-config/openapi-config.yml

This will also not be released in a public package yet - some improvements need to be made for a first "official" release.
If you have trouble creating a local release to work with this hit me up, and I'll show you how.

[stefanmoro]

Rename to catalogue please :) We follow the same naming as the corresponding API domain: https://developer.tidal.com/reference/web-api?spec=catalogue-v2&ref=get-albums-v2

[michpohl]

Rename to catalogue please :) We follow the same naming as the corresponding API domain: https://developer.tidal.com/reference/web-api?spec=catalogue-v2&ref=get-albums-v2

Will do! This info came after the modules had been created and I will fix the naming in a separate PR for both iOS and Android! Good?

[michpohl]

Ok, so I'm not merging this for now. The reason:
openapi-generator doesn't honor the compatibility to API 25 and below, even when the setting is on. Looks like the developers forgot a few classes to cover here...

As you can see above, lint points this out - and initially I wanted to just override this, but since no one uses this yet, I will first do another look at what I can do about it.

[michpohl]

@CanYumusak I found issues with the generator and therefore opted to only push the models for now (as is requested)