Add cards from Genetic Apex and some promo cards

[Xernisfy]

I scraped Bulbapedia for the new cards from TCG Pocket.
Some props like rarity and artist are missing (because it's tricky to parse), I'll add them as soon as possible.

[Xernisfy]

Related to #553

[Xernisfy]

I've added all missing fields now.
Please let me know if this is alright or if anything can be improved.
If card images are needed, I can fetch them as well.

[Joaos98]

Hey man, just asking, is there a reason why you didn't include the releaseDate and images properties, that are present in other sets, for the Pocket sets? I'm planning on doing a small personal project related to TCG Pocket using this API, so I'm just wondering if these fields will be available.

[Xernisfy]

Thanks @Joaos98 for pointing that out. Fields are now up to date.
I updated my scraping tool to generate the sets/en.json file automatically now.

[adback03]

Thanks for this - going to be reviewing and potentially getting this added in the next week or so.

[adback03]

@Xernisfy, would you happen to have the newest expansion as well - Mythical Island?