refactor(module:input-number): refactor input-number support OnPush &…

[vthinkxie]

… nzBlur & nzFocus
close #2340 close #1707 close #1554

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)
[x] 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
[x] No

Other information

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[codecov]

Codecov Report

Merging #2601 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2601      +/-   ##
==========================================
- Coverage   95.64%   95.64%   -0.01%     
==========================================
  Files         495      495              
  Lines       12056    12052       -4     
  Branches     1677     1680       +3     
==========================================
- Hits        11531    11527       -4     
  Misses        167      167              
  Partials      358      358

Impacted Files	Coverage Δ
...mponents/input-number/nz-input-number.component.ts	98.98% <100%> (-0.02%)	⬇️

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