refactor(module:date-picker): will not sort range date

[wenqi73]

Closes #5572
Closes #5651
Closes #5631

• if one value change, the cursor will always move to the other input although has value.
• will not sort the range date.
• when sorting is wrong, reset the other input.

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)
[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
[ ] No

Other information

[codecov]

Codecov Report

Merging #5812 into master will decrease coverage by 0.00%.
The diff coverage is 84.48%.

@@            Coverage Diff             @@
##           master    #5812      +/-   ##
==========================================
- Coverage   90.24%   90.24%   -0.01%     
==========================================
  Files         463      463              
  Lines       13887    13900      +13     
  Branches     2182     2186       +4     
==========================================
+ Hits        12533    12544      +11     
  Misses        833      833              
- Partials      521      523       +2     

Impacted Files	Coverage Δ
components/date-picker/picker.component.ts	92.15% <42.85%> (-5.11%)	⬇️
...mponents/date-picker/date-range-popup.component.ts	91.66% <96.15%> (+0.59%)	⬆️
components/core/time/candy-date.ts	92.15% <100.00%> (+2.36%)	⬆️
components/date-picker/date-picker.service.ts	100.00% <100.00%> (ø)
components/tabs/tab-nav-bar.component.ts	82.33% <0.00%> (+0.70%)	⬆️

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