feat(module:popconfirm): Support custom icon.

[WOOOFEI]

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/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: #2196

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[WOOOFEI]

My first PR, I would appreciate your guidance😊.

[codecov]

Codecov Report

Merging #2445 into next will decrease coverage by <.01%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##             next    #2445      +/-   ##
==========================================
- Coverage   95.84%   95.83%   -0.01%     
==========================================
  Files         487      487              
  Lines       12318    12322       +4     
  Branches     1663     1663              
==========================================
+ Hits        11806    11809       +3     
- Misses        152      153       +1     
  Partials      360      360

Impacted Files	Coverage Δ
components/popconfirm/nz-popconfirm.component.ts	100% <100%> (ø)	⬆️
components/popconfirm/nz-popconfirm.directive.ts	98.11% <66.66%> (-1.89%)	⬇️

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[wzhudev]

Good work!

It's basically useful but here are some enhancements that should be made:

• Add test case.
• Should support TemplateRef. What if users want to use their own icons or two-tone icons?
• Commit message should be in lower case and has no period .
• In your commit message you should write close #2196 in the second line, so that issue would be closed automatically

[wzhudev]

Oh, and the docs.

[WOOOFEI]

Roger！Thank you for your guidance, I'll try again.

[vthinkxie]

HI @WOOOFEI we are going to merge next to master now, plz submit this pr to master now, closed now.