feat(shell): Add times for volume_up and volume_down

[Xiaojun0822]

Add times for volume_up and volume_down func，more flexible volume adjustment

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 26.70%. Comparing base (488b13b) to head (5964214).
Report is 1 commits behind head on master.

Files	Patch %	Lines
adbutils/shell.py	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
- Coverage   26.75%   26.70%   -0.06%     
==========================================
  Files          15       15              
  Lines        1876     1880       +4     
  Branches      306      308       +2     
==========================================
  Hits          502      502              
- Misses       1363     1367       +4     
  Partials       11       11              

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