feat(swiper): support RTL mode

[RaHsu]

ref: #6446
Swiper components support RTL

[1587315093]

写个demo 就够了，不必再起一行说明吧~

[RaHsu]

好的，我把这里精简一下

[github-actions]

PR preview has been successfully built and deployed to https://antd-mobile-preview-pr-6450.surge.sh

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (671ea15) 92.10% compared to head (d5f0b6b) 92.25%.
Report is 15 commits behind head on master.

❗ Current head d5f0b6b differs from pull request most recent head 7fa199d. Consider uploading reports for the commit 7fa199d to get more accurate results

Files	Patch %	Lines
src/components/swiper/swiper.tsx	88.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6450      +/-   ##
==========================================
+ Coverage   92.10%   92.25%   +0.15%     
==========================================
  Files         316      316              
  Lines        6861     6883      +22     
  Branches     1719     1743      +24     
==========================================
+ Hits         6319     6350      +31     
+ Misses        504      497       -7     
+ Partials       38       36       -2     

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[RaHsu]

@1587315093 修改过了，麻烦再review一下哇

[RaHsu]

@zombieJ 麻烦看一下呢，这个提交已经pending一个月了

[asd116725]

大佬们，什么时候合并一下这个需求，正好有阿拉伯语地区的适配需求，目前只能写死覆盖好几处direction: rtl;

[cbbfcd]

大佬们，什么时候合并一下这个需求，正好有阿拉伯语地区的适配需求，目前只能写死覆盖好几处direction: rtl;

@zombieJ +1

[afc163]

@asd116725 @cbbfcd 这个 PR 代码冲突了，需要 @RaHsu 解决一下先。