feat(shell): Add battery function

[Xiaojun0822]

Add battery function to obtain battery status

[codecov]

Codecov Report

Attention: Patch coverage is 36.36364% with 35 lines in your changes are missing coverage. Please review.

Project coverage is 26.66%. Comparing base (fe3aa9c) to head (dcf1bc6).
Report is 2 commits behind head on master.

Files	Patch %	Lines
adbutils/shell.py	5.40%	35 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
+ Coverage   26.40%   26.66%   +0.25%     
==========================================
  Files          15       15              
  Lines        1916     1969      +53     
  Branches      311      314       +3     
==========================================
+ Hits          506      525      +19     
- Misses       1399     1433      +34     
  Partials       11       11              

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[codeskyblue]

It looks fine almost. Unit test should add into tests/

[Xiaojun0822]

It looks fine almost. Unit test should add into tests/

I see that the unit tests for the ShellExtension are all in test-real_device/test_device. py. Please confirm that only the battery is added into tests/ ?