fix(module:drawer): provide custom scroll strategy

[hsuanxyz]

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?

[x] Bugfix
[ ] 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: #2070

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #2095 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2095      +/-   ##
==========================================
+ Coverage   95.96%   95.97%   +0.01%     
==========================================
  Files         473      475       +2     
  Lines       11516    11538      +22     
  Branches     1535     1536       +1     
==========================================
+ Hits        11051    11074      +23     
  Misses        132      132              
+ Partials      333      332       -1

Impacted Files	Coverage Δ
...ts/core/overlay/scroll/nz-block-scroll-strategy.ts	100% <100%> (ø)
components/drawer/nz-drawer.component.ts	97.05% <100%> (+0.23%)	⬆️
.../core/overlay/scroll/nz-scroll-strategy-options.ts	100% <100%> (ø)
components/tabs/nz-tabset.component.ts	96.58% <0%> (+0.85%)	⬆️

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[smile2014]

更新后，现在闪屏很严重