feat(module:datapicker): add [nzInputReadOnly]

[DeckardCainCN]

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: #4534

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

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[DeckardCainCN]

@wenqi73 不好意思。由于我这边直接在对话上修改，导致 CI 没过。后又操作 git reset --hard 误将修改丢失。故这边重开了一个 PR。

[codecov]

Codecov Report

Merging #5488 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5488      +/-   ##
==========================================
+ Coverage   91.15%   91.20%   +0.04%     
==========================================
  Files         453      453              
  Lines       13880    13882       +2     
  Branches     2206     2206              
==========================================
+ Hits        12653    12661       +8     
+ Misses        727      721       -6     
  Partials      500      500              

Impacted Files	Coverage Δ
components/date-picker/date-picker.component.ts	96.52% <100.00%> (+0.02%)	⬆️
components/date-picker/picker.component.ts	96.22% <100.00%> (+0.02%)	⬆️
components/table/src/table-style.service.ts	94.82% <0.00%> (-1.73%)	⬇️
components/core/util/text-measure.ts	91.30% <0.00%> (+1.73%)	⬆️
components/table/src/table/tr-measure.component.ts	100.00% <0.00%> (+13.04%)	⬆️
components/table/src/table/tbody.component.ts	100.00% <0.00%> (+14.28%)	⬆️

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[wenqi73]

LGTM