chore: support angular 8.0

[vthinkxie]

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)
[ ] 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

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Built with commit 80b2d2c

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[codecov]

Codecov Report

Merging #3622 into master will increase coverage by <.01%.
The diff coverage is 89.47%.

@@            Coverage Diff             @@
##           master    #3622      +/-   ##
==========================================
+ Coverage   95.45%   95.46%   +<.01%     
==========================================
  Files         685      685              
  Lines       14042    14056      +14     
  Branches     1865     1871       +6     
==========================================
+ Hits        13404    13418      +14     
+ Misses        231      230       -1     
- Partials      407      408       +1

Impacted Files	Coverage Δ
...mponents/select/nz-select-top-control.component.ts	100% <ø> (ø)	⬆️
...mponents/input-number/nz-input-number.component.ts	97.6% <100%> (+0.01%)	⬆️
components/select/nz-select.component.ts	96.93% <100%> (+0.01%)	⬆️
components/select/nz-select.service.ts	85.77% <100%> (+0.06%)	⬆️
components/core/addon/string_template_outlet.ts	67.24% <84.61%> (+7.66%)	⬆️

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