Add base64 support for zod

[ligazetom]

Hey, take this as a bit more elaborate feature request as I have no idea what I'm doing really.

This PR should generate .base64() constraint if format: byte. If it doesn't, then I think it should :D

Currently I'm doing some post processing on generated zod file to add base64() constraint as well as trim().

I have no idea if trim() could be somehow implemented, but I believe no one really considers whitechars valid, so can it be done at least with some flag maybe?

Let me know if 'implementation' is not total garbage and I'll adjust tests as well, I just don't have really time to spare on these things if the PR maybe won't get even looked at.

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Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 24.79%. Comparing base (7884190) to head (a021f0d).

Files with missing lines	Patch %	Lines
packages/openapi-ts/src/plugins/zod/plugin.ts	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2267      +/-   ##
==========================================
- Coverage   24.80%   24.79%   -0.01%     
==========================================
  Files         299      299              
  Lines       28297    28305       +8     
  Branches     1276     1276              
==========================================
  Hits         7018     7018              
- Misses      21270    21278       +8     
  Partials        9        9              

Flag	Coverage Δ
unittests	24.79% <0.00%> (-0.01%)	⬇️

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[mrlubos]

@ligazetom I'll say go for it, simply because there's no conflicting implementation and you're the first one to request this format. You just need to run pnpm openapi-ts-tests test:update to update snapshots. You'll need to build individual packages if anything fails (openapi-ts, config-vite-base, etc). Thanks for adding this!