Added Zod integration (closes #1159)

[radekmie]

In this pull request, I added a new package: uniforms-bridge-zod, closing #1159. The implementation is really straightforward and documented in a step-by-step tutorial on my blog: "On uniforms Integration With Zod".

Open topics:

1. How to switch between sync and async validation? Zod allows both, but before you actually run it, you don't know if it's going to be async or not. Doing it async by default is not ideal either, as it results in multiple renders for sync schemas.
   • We can handle it with an option passed to the ZodBridge constructor.
2. Is ZodError the only accepted error format? I think it does - it's well documented and typed. But maybe we should handle others as well?
3. How to implement getErrorMessages? Right now it does the same thing as getErrorMessage, resulting in messages like "Value should be greater than or equal to 10000" which makes sense for inline errors, but doesn't work for the ErrorsField component.
   • We can prefix them with the field's label, but it won't be useful for list fields. But maybe that's OK?
4. What additional schema-specific props are useful? For now I added maxCount/minCount for arrays and max/min/step for numbers. I'm thinking about things like .email() for string schemas being mapped to type: 'email'. It may be handy for some themes but problematic in others.
5. How to pass custom props through the schema? There's no thing like that in Zod, or at least nothing I found out of the box. There's Data representation of schema? colinhacks/zod#507, and while it's not entirely that use case, I agree that it doesn't make sense to add it there.
   • A workaround for now is to provide the props directly in the JSX or subclassing the ZodBridge and extending the getProps function.

I've marked is at v3.x, but I'd rather see it as a v4.0 beta thing, due to bridge methods (see comments in the code).

[codecov]

Codecov Report

Merging #1169 (ee67bd3) into master (74cd151) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1169      +/-   ##
==========================================
+ Coverage   98.49%   98.54%   +0.05%     
==========================================
  Files         228      231       +3     
  Lines        3643     3769     +126     
  Branches      948      997      +49     
==========================================
+ Hits         3588     3714     +126     
  Misses          4        4              
  Partials       51       51              

Impacted Files	Coverage Δ
packages/uniforms-bridge-zod/src/ZodBridge.ts	100.00% <100.00%> (ø)
packages/uniforms-bridge-zod/src/index.ts	100.00% <100.00%> (ø)
packages/uniforms-bridge-zod/src/register.ts	100.00% <100.00%> (ø)
packages/uniforms-material/src/DateField.tsx	90.90% <0.00%> (-1.10%)	⬇️
packages/uniforms/src/useForm.ts	100.00% <0.00%> (ø)
packages/uniforms/src/BaseForm.tsx	100.00% <0.00%> (ø)
packages/uniforms-mui/src/DateField.tsx	100.00% <0.00%> (ø)
packages/uniforms-semantic/src/DateField.tsx	100.00% <0.00%> (ø)
packages/uniforms-unstyled/src/DateField.tsx	100.00% <0.00%> (ø)
packages/uniforms-bootstrap3/src/DateField.tsx	100.00% <0.00%> (ø)
... and 2 more

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