feat(abc:st): add drag property

[cipchk]

• close st可否增加拖拽排序功能？ ng-alain#1835

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/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

[cipchk]

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 94.97%. Comparing base (e28a21a) to head (406d9be).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
packages/abc/st/st.component.ts	66.66%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1876      +/-   ##
==========================================
- Coverage   95.00%   94.97%   -0.03%     
==========================================
  Files         273      273              
  Lines        8850     8859       +9     
  Branches     1710     1814     +104     
==========================================
+ Hits         8408     8414       +6     
- Misses        364      366       +2     
- Partials       78       79       +1     

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