refactor(module:avatar): refactor and aync Ant Design 4

[hsuanxyz]

ref #4634

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
[ ] Feature
[ ] Code style update (formatting, local variables)
[x] 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

❗ No coverage uploaded for pull request base (master@374eb84). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #4662   +/-   ##
=========================================
  Coverage          ?   92.95%           
=========================================
  Files             ?      505           
  Lines             ?    12723           
  Branches          ?     1971           
=========================================
  Hits              ?    11827           
  Misses            ?      472           
  Partials          ?      424

Impacted Files	Coverage Δ
components/avatar/avatar.module.ts	100% <ø> (ø)
components/avatar/avatar.component.ts	98.41% <100%> (ø)

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