Add dedicated error for "Referential integrity violation"

[e965]

At the moment, you need to write this check code every time:

if (error instanceof Error && error.message === "Referential integrity violation") {
  ...
}

I would like to have a special instance (extended Error) so I can write more shortly:

import { RlsError } from 'prisma-rls'

if (error instanceof RlsError) {
  ...
}

RlsError it's an example name