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-inline	水平内边距	12px	--adm-card-padding-inline
--header-border-width	header 分割线宽度	0.5px	--adm-card-header-border-width
--header-border-color	header 分割线颜色	var(--adm-color-border)	--adm-card-header-border-color
--header-padding-block	header 垂直内边距	12px	--adm-card-header-padding-block
--body-padding-block	body 垂直内边距	12px	--adm-card-body-padding-block

[github-actions[bot]]

Size Change: +113 B (+0.03%)

Total Size: 352 kB

Filename	Size	Change
./lib/bundle/antd-mobile.compatible.umd.js	189 kB	+58 B (+0.03%)
./lib/bundle/style.css	18 kB	+55 B (+0.31%)

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[bot]]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
./lib/bundle/antd-mobile.es.js	102 KB	2.1 s (0%)	1.1 s (+4.19% 🔺)	3.2 s

[github-actions[bot]]

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.28%. Comparing base (cf550e4) to head (073def4). Report is 14 commits behind head on master.

:exclamation: Current head 073def4 differs from pull request most recent head 16a3f5b

Please upload reports for the commit 16a3f5b to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6583 +/- ## ========================================== - Coverage 92.34% 92.28% -0.06% ========================================== Files 318 318 Lines 6910 6962 +52 Branches 1729 1754 +25 ========================================== + Hits 6381 6425 +44 - Misses 493 499 +6 - Partials 36 38 +2 ```

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[zombieJ]

哦，等等。css var 可能还要一个 card.patch.less