WIP feat(module:button): add nzColor and nzVariant

[Laffery]

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?

Issue Number: N/A

What is the new behavior?

support nzColor and nzVariant, align with antd

https://ant.design/components/button#button-demo-color-variant

Does this PR introduce a breaking change?

• Yes
• No

Other information

RFC: ant-design/ant-design#49700

[zorro-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.99%. Comparing base (42bbb0c) to head (64d1361).
Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
components/button/button.component.ts	95.83%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9237      +/-   ##
==========================================
- Coverage   91.99%   91.99%   -0.01%     
==========================================
  Files         560      560              
  Lines       19617    19652      +35     
  Branches     3095     3106      +11     
==========================================
+ Hits        18047    18079      +32     
- Misses       1233     1234       +1     
- Partials      337      339       +2     

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[WwwHhhYran]

🤔 有一个疑问：nzType 和 nzVariant 有一些选项是重复的，比如 'dashed', 'link', 'text'，nzColor 也与 nzType 有重复，比如 ‘primary’。nzColor 和 nzType 一起使用可以理解的，能够组合出不同的 type + color，一个对应形态，一个对应颜色；但是 nzVariant 和 nzType 是不是本身在语义上就有一定的重复？

[Laffery]

🤔 有一个疑问：nzType 和 nzVariant 有一些选项是重复的，比如 'dashed', 'link', 'text'，nzColor 也与 nzType 有重复，比如 ‘primary’。nzColor 和 nzType 一起使用可以理解的，能够组合出不同的 type + color，一个对应形态，一个对应颜色；但是 nzVariant 和 nzType 是不是本身在语义上就有一定的重复？

我理解 nzType 属于预设样式，nzVariant + nzColor 供用户灵活变体。比如用户的设计系统里面就是希望 primary 按钮是 dashed + green，过去只能通过 css 设置，现在有更灵活方便的选项供选择

[HyperLife1119]

RFC: ant-design/ant-design#49700