build: upgrade father to 4

[PeachScript]

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1. 升级 father 到 4.0 RC，构建持久缓存提速非常明显（命中时 120ms 内完成构建）
2. 为纯 type import 添加 type 标记，避免产物有无效导出

[vercel[bot]]

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Name	Status	Preview	Updated
field-form	✅ Ready (Inspect)	Visit Preview	Sep 1, 2022 at 2:40AM (UTC)

[codecov[bot]]

Codecov Report

Merging #479 (2e5c92c) into master (d789287) will decrease coverage by 0.16%. The diff coverage is n/a.

:exclamation: Current head 2e5c92c differs from pull request most recent head b8d1666. Consider uploading reports for the commit b8d1666 to get more accurate results

@@            Coverage Diff             @@
##           master     #479      +/-   ##
==========================================
- Coverage   99.91%   99.74%   -0.17%     
==========================================
  Files          16       19       +3     
  Lines        1132     1185      +53     
  Branches      252      244       -8     
==========================================
+ Hits         1131     1182      +51     
- Misses          1        3       +2     

Impacted Files	Coverage Δ
src/index.tsx	100.00% <ø> (ø)
tests/common/timeout.ts	100.00% <0.00%> (ø)
tests/common/InfoField.tsx	100.00% <0.00%> (ø)
tests/common/index.ts	95.00% <0.00%> (ø)

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