feat(module:anchor): horizontal anchors

[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?

Our project lacks the horizontal anchor feature that ant design provides.

What is the new behavior?

Added horizontal anchor

Does this PR introduce a breaking change?

[ ] Yes
[✔] No

Other information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.73%. Comparing base (df766b6) to head (6a0a92e).
Report is 43 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8342   +/-   ##
=======================================
  Coverage   91.73%   91.73%           
=======================================
  Files         520      520           
  Lines       18010    18015    +5     
  Branches     2838     2839    +1     
=======================================
+ Hits        16521    16526    +5     
  Misses       1186     1186           
  Partials      303      303           

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[Nicoss54]

LGTM