feat(module:drawer): add nzDrawerContent directive

[hsuanxyz]

DEPRECATED: Usage <ng-content></ng-content> is deprecated, use <ng-template nzDrawerContent></ng-template> to declare the contents of the drawer.

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: 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 #6085 (fed21e5) into master (3204927) will decrease coverage by 0.01%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master    #6085      +/-   ##
==========================================
- Coverage   89.89%   89.88%   -0.02%     
==========================================
  Files         465      466       +1     
  Lines       14057    14210     +153     
  Branches     2311     2237      -74     
==========================================
+ Hits        12636    12772     +136     
- Misses        873      887      +14     
- Partials      548      551       +3     

Impacted Files	Coverage Δ
components/drawer/drawer.module.ts	100.00% <ø> (ø)
components/drawer/drawer-content.directive.ts	50.00% <50.00%> (ø)
components/drawer/drawer.component.ts	97.91% <100.00%> (+0.06%)	⬆️
components/table/src/table/tr-expand.directive.ts	25.00% <0.00%> (-25.00%)	⬇️
components/badge/ribbon.component.ts	30.00% <0.00%> (-7.50%)	⬇️
components/tree-select/tree-select.component.ts	90.17% <0.00%> (-3.39%)	⬇️
...omponents/table/src/cell/th-selection.component.ts	30.76% <0.00%> (-2.57%)	⬇️
components/table/src/addon/selection.component.ts	7.69% <0.00%> (-1.40%)	⬇️
components/cascader/cascader.component.ts	94.51% <0.00%> (-0.16%)	⬇️
components/code-editor/code-editor.component.ts	14.65% <0.00%> (-0.13%)	⬇️
... and 68 more

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