feat: 优化 form 样式 & 默认渲染 extra 节点

[honkinglin]

No description provided.

[github-actions]

Size Change: -243 B (0%)

Total Size: 617 kB

Filename	Size	Change
./dist/tdesign.js	344 kB	-570 B (0%)
./dist/tdesign.min.js	197 kB	+327 B (0%)

ℹ️ View Unchanged

Filename	Size
./dist/tdesign.css	40.5 kB
./dist/tdesign.min.css	35.8 kB

[github-actions]

[github-actions]

Size Change: -243 B (0%)

Total Size: 617 kB

Filename	Size	Change
./dist/tdesign.js	344 kB	-570 B (0%)
./dist/tdesign.min.js	197 kB	+327 B (0%)

ℹ️ View Unchanged

Filename	Size
./dist/tdesign.css	40.5 kB
./dist/tdesign.min.css	35.8 kB

[codecov-commenter]

Codecov Report

Merging #730 (a3d9ad6) into develop (a0db0df) will increase coverage by 0.08%.
The diff coverage is 72.72%.

❗ Current head a3d9ad6 differs from pull request most recent head eb056f7. Consider uploading reports for the commit eb056f7 to get more accurate results

@@             Coverage Diff             @@
##           develop     #730      +/-   ##
===========================================
+ Coverage    57.56%   57.64%   +0.08%     
===========================================
  Files          346      346              
  Lines        12828    12829       +1     
  Branches      2405     2403       -2     
===========================================
+ Hits          7384     7395      +11     
+ Misses        5200     5189      -11     
- Partials       244      245       +1     

Impacted Files	Coverage Δ
src/form/const.ts	100.00% <ø> (ø)
src/slider/props.ts	75.00% <0.00%> (-25.00%)	⬇️
src/form/form-item.tsx	43.33% <25.00%> (+0.27%)	⬆️
src/utils/withInstall.ts	87.50% <33.33%> (-12.50%)	⬇️
src/index.ts	100.00% <100.00%> (ø)
src/slider/slider-button.tsx	25.00% <100.00%> (+0.90%)	⬆️
src/slider/slider.tsx	59.29% <100.00%> (+5.15%)	⬆️

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[cong-min]

这里希望能像其他地方一样加一下判断：if (Vue._installedPlugins.indexOf(VueCompositionAPI) === -1) Vue.use(VueCompositionAPI);
现在不判断会和其他库产生冲突导致报错：