feat(module:input-number): add nzReadOnly property

[chenc041]

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)
[ ] 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: #7369

Closes: #7369

What is the new behavior?

Add new property of nzReadOnly

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #7372 (12c7185) into master (64e1c7c) will decrease coverage by 0.03%.
The diff coverage is 75.00%.

❗ Current head 12c7185 differs from pull request most recent head 9d713bd. Consider uploading reports for the commit 9d713bd to get more accurate results

@@            Coverage Diff             @@
##           master    #7372      +/-   ##
==========================================
- Coverage   91.62%   91.58%   -0.04%     
==========================================
  Files         487      487              
  Lines       16013    16016       +3     
  Branches     2604     2605       +1     
==========================================
- Hits        14672    14669       -3     
- Misses       1027     1035       +8     
+ Partials      314      312       -2     

Impacted Files	Coverage Δ
components/core/config/config.ts	100.00% <ø> (ø)
components/code-editor/code-editor.service.ts	19.75% <66.66%> (+0.76%)	⬆️
components/input-number/input-number.component.ts	98.64% <100.00%> (+<0.01%)	⬆️
components/table/src/table/tbody.component.ts	88.88% <0.00%> (-11.12%)	⬇️
...ts/table/src/table/table-inner-scroll.component.ts	79.41% <0.00%> (-4.42%)	⬇️
components/table/src/table/tr-measure.component.ts	86.95% <0.00%> (-4.35%)	⬇️
components/table/src/table-style.service.ts	96.55% <0.00%> (+1.72%)	⬆️

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[simplejason]

Unnecessary whitespace, please check your config of prettier :)

[chenc041]

done

[simplejason]

LGTM