feat(#1747): Add Start and End to ZodString

[santosmarco-caribou]

This PR adds two type parameters to ZodString: Start and End. They are populated by the .startsWith() and .endsWith() methods to improve inference.

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[colinhacks]

Thanks for the PR. I have some reservations discussed here: #1730 (comment)

[colinhacks]

Interesting idea, but I'd like to avoid adding type parameters onto the primitive schema types like ZodString to keep the types simpler in Intellisense. I generally think that's more important here, and this use case will be covered by a future template literal API anyway. But thanks!

[spiftire]

I would love to have this feature. Any plans to add this?

[stale]

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.