[Feature]: Add Fanatical as provider.

[moonstar-x]

We can make a request to:

GET https://www.fanatical.com/api/all-promotions/en

This seems to return some interesting JSON with a freePromotions object.

You can also request this endpoint:

GET https://www.fanatical.com/api/all/en

Which returns an enormous JSON with presumably the entire inventory?

In any case, as of today, the game Spirit of the North is free. This is the endpoint corresponding to that game:

GET https://www.fanatical.com/api/products-group/spirit-of-the-north/en

Adding in some attachments with the current data to use:

spirit-of-the-north.json
all.json
all-promotions.json