feat(module:watermark): add watermark component

[OriginRing]

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: N/A

What is the new behavior?

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

Merging #7857 (8a6819c) into master (3dfa655) will decrease coverage by 0.05%.
The diff coverage is 86.75%.

❗ Current head 8a6819c differs from pull request most recent head 250f38b. Consider uploading reports for the commit 250f38b to get more accurate results

@@            Coverage Diff             @@
##           master    #7857      +/-   ##
==========================================
- Coverage   91.79%   91.74%   -0.05%     
==========================================
  Files         506      509       +3     
  Lines       17304    17455     +151     
  Branches     2748     2770      +22     
==========================================
+ Hits        15884    16014     +130     
- Misses       1128     1144      +16     
- Partials      292      297       +5     

Impacted Files	Coverage Δ
components/water-mark/util.ts	70.00% <70.00%> (ø)
components/water-mark/water-mark.component.ts	89.23% <89.23%> (ø)
components/water-mark/water-mark.module.ts	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

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[simplejason]

LGTM