feat(module: imagepicker): add capture&disableDelete API

[fisherspy]

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
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] 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

[codecov]

Codecov Report

Merging #410 into master will decrease coverage by 3.48%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #410      +/-   ##
==========================================
- Coverage   89.17%   85.68%   -3.49%     
==========================================
  Files         321      321              
  Lines        7101     7711     +610     
  Branches      584     1095     +511     
==========================================
+ Hits         6332     6607     +275     
- Misses        590      665      +75     
- Partials      179      439     +260

Impacted Files	Coverage Δ
components/image-picker/image-picker.component.ts	72.65% <100%> (-7.17%)	⬇️
components/core/wave/nz-wave.directive.ts	83.33% <0%> (-16.67%)	⬇️
components/core/util/touch-event.ts	66.66% <0%> (-16.67%)	⬇️
components/picker/picker.component.ts	69.69% <0%> (-12.28%)	⬇️
...ponents/core/directive/touch-feedback.component.ts	58.33% <0%> (-11.67%)	⬇️
...nents/pull-to-refresh/pull-to-refresh.component.ts	72.12% <0%> (-11.22%)	⬇️
components/picker/picker.service.ts	85% <0%> (-9.45%)	⬇️
components/core/wave/nz-wave-renderer.ts	87.5% <0%> (-8.8%)	⬇️
...ts/input-item/custom-input/custom-input.service.ts	84.84% <0%> (-8.49%)	⬇️
...ts/carousel/dotindicator/dotindicator.component.ts	75% <0%> (-8.34%)	⬇️
... and 69 more

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[BronzeCui]

ok