feat(prisma): Support multi file Prisma schemas

[dthyresson]

feat(prisma): Support multi file Prisma schemas (#10869) by @dthyresson

Prisma's prismaSchemaFolder feature allows you to define multiple files in a schema subdirectory of your prisma directory.

This PR updates:

• Prisma utilities
• generators
• dbAuth setup
• documentation

to support single and multi file Prisma schemas.

If you have enabled Prisma multi file schemas, you configure your project toml api schemaPath setting the directory where your schema.prisma can be found, for example: './api/db/schema'

When organizing your Prisma Schema into multiple files, you will need enable that feature in Prisma, move your schema.prisma file into a new directory such as ./api/db/schema and then set schemaPath in the api toml config.
:::

For example:

[api]
  port = 8911  
  schemaPath = "./api/db/schema"

[Josh-Walker-GM]

Sorry for the delayed review on this. I have some comments but mostly just seeking some clarification for my own benefit. I don't intend to come across as nit-picky so sorry in advance if I do so!