Add string jwt

[danilomourelle]

Add a .jwt() validator in string type.

It expects for a string with 3 parts splited by . with the first part being a base64 encoded string that represents a objetc wit a property type with value JWT.

It validates just format NOT signature.

Resolves #2946

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[hudson-bruno]

Just a reminder that you left some console.logs in the code

[danilomourelle]

Ooopss... thanks man, already removed.

[nikelborm]

Why wasn't this PR merged yet? It will be very useful for my use case! Does it need some improvements?

[danilomourelle]

Hey guys, anything else I should do to it be accept?

[danilomourelle]

Hello @colinhacks

I believe this PR are good to go. Let me know if need anything else.

[colinhacks]

Thanks, this is excellent stuff! Apologies for the long turnaround time. I'm hesitant to merge features like this into Zod 3 for bundle size reasons. Zod 4 will have better tree shaking characteristics so I'm merging this into the v4 branch. Some version of this will land in Zod 4, but (as a heads up) it may be a while, and this feature/API will likely undergo some changes in the interim.