feat(module: pulltorefresh): feat support scrollendrefresh and support both up and down

[Guoyuanqiang]

…t both up and down

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
[ ] 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 #204 into master will decrease coverage by 0.21%.
The diff coverage is 63.15%.

@@            Coverage Diff             @@
##           master     #204      +/-   ##
==========================================
- Coverage   86.46%   86.25%   -0.22%     
==========================================
  Files         224      224              
  Lines        7204     7251      +47     
  Branches     1008     1019      +11     
==========================================
+ Hits         6229     6254      +25     
- Misses        573      589      +16     
- Partials      402      408       +6

Impacted Files	Coverage Δ
...mponents/pull-to-refresh/pull-to-refresh.module.ts	100% <100%> (ø)	⬆️
...nents/pull-to-refresh/pull-to-refresh.component.ts	77.07% <62.66%> (-10.32%)	⬇️

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[fisherspy]

   private _onChanged: (value: object) => {};
   private _onTouched: () => {};

change to

 private _ngModelOnChange: (value: object) => {};

 private _ngModelOnTouched: () => {};