Upgrade GraphQL to v16 and resolve peer dependency issues

[bcanfield]

The main problem here is type-graphql is still using GraphQL v15. So there is no guaranteed way for us to migrate to GraphQL 16 without some potential breaking changes.

This issue is just here to serve as a discussion starter for an agreed-upon path forward.

• Wait a reasonable time for type-graphql to catch up
• Move to an alternate library
• Write a custom solution (No thanks)

[keonik]

This looks to be the jumping-off point for removing type-graphql-prisma 😢 Prisma had a restructure that affected typegraphql-prisma library.

[keonik]

For now until we find an alternative stick with GraphQL 15

[mwillbanks]

The beta versions support graphql 16 fyi.