Add Prisma 4

[Matt Troncali]

• Add Prisma wrapper to provide database environment variables from Nest configuration.
• Integrate Prisma wrapper with Nx to run commands and cache output.
  • Support split Prisma schema files so that fragments can be stored in their respective model libraries.
• Add default Prisma service library for NestJS that provides the desired PrismaClient.
• Support potential for concurrently using more than one Prisma schema / PrismaClient in the monorepo.
  • Library module for PostgreSQL
  • Library module for MongoDB
• Update migrator and seeder modules to ensure they work with both Prisma and TypeORM.
• Add documentation on data access through Prisma and TypeORM
• Test Prisma data access.
• Benchmark against TypeORM data access. Moved to Nest backlog #24