feat(module:date-picker): support date-picker placement

[TheBeard30]

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: #7389

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

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[codecov]

Codecov Report

Merging #7527 (0f27d5c) into master (44d9770) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 0f27d5c differs from pull request most recent head d19fe85. Consider uploading reports for the commit d19fe85 to get more accurate results

@@            Coverage Diff             @@
##           master    #7527      +/-   ##
==========================================
- Coverage   91.73%   91.72%   -0.01%     
==========================================
  Files         502      502              
  Lines       16699    16710      +11     
  Branches     2750     2605     -145     
==========================================
+ Hits        15319    15328       +9     
- Misses       1050     1054       +4     
+ Partials      330      328       -2     

Impacted Files	Coverage Δ
...nents/input-number/input-number-group.component.ts	98.96% <ø> (ø)
components/input-number/input-number.module.ts	100.00% <ø> (ø)
components/input/input-group.component.ts	98.96% <ø> (ø)
components/core/overlay/overlay-position.ts	92.30% <100.00%> (+1.39%)	⬆️
components/date-picker/date-picker.component.ts	92.76% <100.00%> (+0.18%)	⬆️
components/input-number/input-number.component.ts	99.60% <100.00%> (+<0.01%)	⬆️
components/input/input.directive.ts	98.57% <100.00%> (ø)
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%)	⬇️
... and 2 more

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[wenqi73]

还得有多个 position，否则滚动屏幕后 overlay 不会自动换位置。
参考下

ng-zorro-antd/components/tooltip/base.ts

Line 374 in ea1138b

this._positions = [...preferredPosition, ...DEFAULT_TOOLTIP_POSITIONS];

[TheBeard30]

好的，我以为指定之后，就不能自动更换了👌🏻

[wenqi73]

LGTM, good job!