[Feature Request] Support for bigint coercion similar to date()

[JackMBurch]

When parsing rest API responses back to prisma types using the generated schemas it's often an issue for bigints as they have to be converted to strings. It would be great to have them coerced back into bigints automatically when using the schemas parse similar to how dates are currently.

Implementation would change generated schemas from something like this:

export const EmailVerificationsSchema = z.object({
  id: z.bigint(),
  userId: z.bigint(),
  token: z.string(),
  createdAt: z.coerce.date(),
});

to this:

export const EmailVerificationsSchema = z.object({
  id: z.coerce.bigint(),
  userId: z.coerce.bigint(),
  token: z.string(),
  createdAt: z.coerce.date(),
});