Migrate from objection to prisma

[lhnrd]

In light of this recent issue Vincit/objection.js#2335, I've decide to migrate from objection (unfortunately) and use prisma. I think in the end it'll speed up development and improve TS types.

Things to change:

• Remove models
• Remove knex service
• Create prisma schema
• Create prisma service
  • How to integrate with fastify
• Investigate how to integrate fishery with prisma
• Create seeds
• Create migrations