refactor: removed all usages of <color-sketch>

[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)
[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?

Currently there are 2 usages of an external library called color-sketch in our codebase; one in the Watermark component, and another one in the footer of the doucment site.

What is the new behavior?

Removed all usages of color-sketch and use Ng-zorro's built-in color picker.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Usages:

[zorro-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.57%. Comparing base (81ef077) to head (b0d78d6).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8465      +/-   ##
==========================================
- Coverage   91.57%   91.57%   -0.01%     
==========================================
  Files         533      532       -1     
  Lines       18336    18334       -2     
  Branches     2801     2801              
==========================================
- Hits        16792    16789       -3     
- Misses       1226     1227       +1     
  Partials      318      318              

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[Laffery]

Hi @ParsaArvanehPA , thanks to your nice contribution, I left some suggesions to remove useless styles and I hope this message finds you well :)

[ParsaArvanehPA]

Hi @ParsaArvanehPA , thanks to your nice contribution, I left some suggesions to remove useless styles and I hope this message finds you well :)

Hi @Laffery , thank you for checking my PR.
I think you forgot to submit your reviews because I don't see any requested changes.

[Laffery]

Hi @Laffery , thank you for checking my PR. I think you forgot to submit your reviews because I don't see any requested changes.

@ParsaArvanehPA I'm sorry about that, it's available now

[ParsaArvanehPA]

Hi @Laffery , thank you for checking my PR. I think you forgot to submit your reviews because I don't see any requested changes.

@ParsaArvanehPA I'm sorry about that, it's available now

Changes have been made, thanks again for checking it out @Laffery