feat(module:empty): support standalone component

[ParsaArvanehPA]

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)
[ ] 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?

What is the new behavior?

Updated Empty component to work as a standalone component.

Does this PR introduce a breaking change?

[ ] Yes
[✔] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (165f171) 91.71% compared to head (e4b8f19) 91.70%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8254      +/-   ##
==========================================
- Coverage   91.71%   91.70%   -0.01%     
==========================================
  Files         518      518              
  Lines       17887    17887              
  Branches     2837     2837              
==========================================
- Hits        16405    16404       -1     
  Misses       1181     1181              
- Partials      301      302       +1     

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[Nicoss54]

LGTM

[OriginRing]

LGTM