feat(card): css variables for border and padding

[guoyunhe]

CSS 变量

属性	说明	默认值	全局变量
--border-radius	圆角大小	8px	--adm-card-border-radius
--padding-x	水平内边距	12px	--adm-card-padding-x
--padding-y	垂直内边距	12px	--adm-card-padding-y
--header-border-width	头部分割线宽度	0.5px	--adm-card-header-border-width
--header-border-color	头部分割线颜色	var(--adm-color-border)	--adm-card-header-border-color

[github-actions]

Size Change: +136 B (0%)

Total Size: 353 kB

Filename	Size	Change
./lib/bundle/antd-mobile.compatible.umd.js	189 kB	+59 B (0%)
./lib/bundle/style.css	18 kB	+77 B (0%)

ℹ️ View Unchanged

Filename	Size
./lib/bundle/antd-mobile.umd.js	144 kB
./lib/bundle/css-vars-patch.css	1.43 kB

_{compressed-size-action}

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
./lib/bundle/antd-mobile.es.js	137.36 KB	2.8 s (0%)	1.2 s (+10.89% 🔺)	4 s

[github-actions]

PR preview has been successfully built and deployed to https://antd-mobile-preview-pr-6583.surge.sh

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.28%. Comparing base (bfbc96e) to head (073def4).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6583      +/-   ##
==========================================
- Coverage   92.34%   92.28%   -0.06%     
==========================================
  Files         318      318              
  Lines        6909     6962      +53     
  Branches     1729     1754      +25     
==========================================
+ Hits         6380     6425      +45     
- Misses        493      499       +6     
- Partials       36       38       +2     

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