feat(module:input): support for allow clear

[HyperLife1119]

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?

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 91.40%. Comparing base (dbebd02) to head (d9f1215).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9452      +/-   ##
==========================================
- Coverage   91.44%   91.40%   -0.05%     
==========================================
  Files         563      563              
  Lines       19817    19813       -4     
  Branches     3177     3175       -2     
==========================================
- Hits        18122    18110      -12     
- Misses       1350     1358       +8     
  Partials      345      345              

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[Nicoss54]

LGTM

[Laffery]

LGTM

注意到在 antd 支持了 onClear 回调函数，相应地我们应该增加 nzOnClear 回调函数？WDYT

[Laffery]

LGTM