DS commerce. E commerce for Directus 9

For MVP, let's just ignore

• taxes
• complex products
• vendors
• supliers
• coupons

Licence

GPLv3 is temporary, because no one should use this code in production, I'll switch to more permissive licence when things start to work

Directus missing features

• ItemsService generics
• ItemsService.prototype.readbyQuery can return Record, why?