Tab characters make schema parser unhappy + unclear error

[sdnts]

Steps to reproduce:

1. In a new schema.prisma file, type in:

datasource db {
  provider = "postgresql"
  url      = "postgresql://siddhant@localhost:5432/experiments?schema=public"
}

model User {
  id      Int    @id
}

2. If you're on VSCode, Cmd+Shift+P -> Convert indentation to Tabs

prisma2 dev or a lift save + up will now fail.

FWIW, the VSCode plugin does complain before running the migration, but it is not clear what the error actually is.

[matthewmueller]

fixed by: https://github.com/prisma/prisma/pulls/4817