perf(module: modal): perf modal import CoreModule.

[Guoyuanqiang]

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-mobile/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
[x] 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

[codecov]

Codecov Report

Merging #348 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #348      +/-   ##
=========================================
+ Coverage   89.54%   89.6%   +0.05%     
=========================================
  Files         229     229              
  Lines        6879    6880       +1     
  Branches      563     563              
=========================================
+ Hits         6160    6165       +5     
+ Misses        554     550       -4     
  Partials      165     165

Impacted Files	Coverage Δ
components/modal/modal.module.ts	100% <100%> (ø)	⬆️
components/picker/picker.component.ts	81.97% <0%> (+1.74%)	⬆️
components/picker/picker.service.ts	94.44% <0%> (+5.55%)	⬆️

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