feat(module: swipe-action): add className api

[BronzeCui]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd-mobile/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #436 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #436   +/-   ##
=======================================
  Coverage   85.77%   85.77%           
=======================================
  Files         314      314           
  Lines        7623     7623           
  Branches     1082     1082           
=======================================
  Hits         6539     6539           
  Misses        655      655           
  Partials      429      429

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c09b85e...c8c3ef9. Read the comment docs.