Add `class` getter to the return of `z.instanceof`

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[colinhacks]

This is a well made PR, but I'm not convinced it's worth introducing a new subclass of ZodType just to add the class getter. Is there a compelling argument in favor? Keep in mind that I'm in a continual struggle to keep the bundle size of Zod low - it's at 10KB currently and I get complaints with some regularity.

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.