feat: rules support warningOnly

[zombieJ]

本来以为要改 async-validator，好像勾一下也行了？

顺道做了一下：ant-design/ant-design#30016

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[codecov]

Codecov Report

Merging #304 (2f75e5d) into master (e118381) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #304   +/-   ##
=======================================
  Coverage   99.89%   99.90%           
=======================================
  Files          13       13           
  Lines         973     1005   +32     
  Branches      230      230           
=======================================
+ Hits          972     1004   +32     
  Misses          1        1           

Impacted Files	Coverage Δ
src/FieldContext.ts	100.00% <ø> (ø)
src/utils/asyncUtil.ts	100.00% <ø> (ø)
src/Field.tsx	100.00% <100.00%> (ø)
src/useForm.ts	99.74% <100.00%> (+<0.01%)	⬆️
src/utils/validateUtil.ts	100.00% <100.00%> (ø)

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[crazyair]

到 ant-design 了，warning 需要黄色显示吗？

[zombieJ]

到 ant-design 了，warning 需要黄色显示吗？

嗯，现在 antd 有 warning 类型。但是需要手工设置，底层支持后就可以自动切 warning 状态了。