feat(module:modal): support dragging (#7389)

[ZENETOM]

PR Checklist

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• 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: N/A

What is the new behavior?

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 #7852 (c7eef56) into master (e95cdb6) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head c7eef56 differs from pull request most recent head 4dd187b. Consider uploading reports for the commit 4dd187b to get more accurate results

@@            Coverage Diff             @@
##           master    #7852      +/-   ##
==========================================
+ Coverage   92.09%   92.10%   +0.01%     
==========================================
  Files         502      502              
  Lines       16819    16821       +2     
  Branches     2577     2662      +85     
==========================================
+ Hits        15489    15493       +4     
+ Misses       1059     1056       -3     
- Partials      271      272       +1     

Impacted Files	Coverage Δ
components/modal/modal-container.component.ts	100.00% <ø> (ø)
components/modal/modal.module.ts	100.00% <ø> (ø)
components/modal/utils.ts	100.00% <ø> (ø)
components/modal/modal-types.ts	100.00% <100.00%> (ø)
components/modal/modal.component.ts	95.87% <100.00%> (+0.04%)	⬆️
components/tabs/tab-add-button.component.ts	75.00% <0.00%> (-25.00%)	⬇️
components/tabs/tab-nav-bar.component.ts	87.94% <0.00%> (+1.41%)	⬆️

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[HyperLife1119]

Thanks for the contribution, the modal component has just gotten drag and drop support via #8419, I will close this.