fix(module:input-number): use input event instead of change event

[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: #8985

What is the new behavior?

• 支持键入空字符串以将值置为 null
• 在 input 事件发出时也会触发 ngModelChange

Does this PR introduce a breaking change?

• Yes
• No

Other information

[zorro-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.93%. Comparing base (2d8968d) to head (b07d22a).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8989      +/-   ##
==========================================
- Coverage   91.93%   91.93%   -0.01%     
==========================================
  Files         555      555              
  Lines       19712    19719       +7     
  Branches     2946     2947       +1     
==========================================
+ Hits        18122    18128       +6     
  Misses       1264     1264              
- Partials      326      327       +1     

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