Improve types

[dziraf]

We were unable to find some types by importing them from @prisma/client, examples:
https://github.com/SoftwareBrothers/adminjs-prisma/blob/main/src/types.ts#L4
https://github.com/SoftwareBrothers/adminjs-prisma/blob/main/src/Resource.ts#L30

Find out if there are generic types for model functions and if there's a built-in Prisma client type which includes _dmmf.

[millsp]

We don't have generic types for model functions right now as these are generated.