Add support for Postgres arrays mapped to JSON

[elledienne]

Summary

• Add support for Postgres arrays (string[], int[], etc.) by mapping them to JSON
• Remove filter that previously excluded array fields from schema generation
• Map array types to json<type[]>() syntax for proper TypeScript type safety

Example

model User {
  id    String   @id
  tags  String[] // Maps to json<string[]>()
  scores Int[]?  // Maps to json<number[]>().optional()
  roles UserRole[] // Maps to json<UserRole[]>()
}