feat(module:notification): 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 Notification component to work as a standalone component.

Does this PR introduce a breaking change?

[ ] Yes
[✔] No

Other information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5fd0b31) 91.70% compared to head (362aeb4) 91.71%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8236      +/-   ##
==========================================
+ Coverage   91.70%   91.71%   +0.01%     
==========================================
  Files         519      518       -1     
  Lines       17887    17886       -1     
  Branches     2836     2836              
==========================================
+ Hits        16403    16404       +1     
+ Misses       1182     1181       -1     
+ Partials      302      301       -1     

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[HyperLife1119]

LGTM