feat: add ExecCommand method for executing shell commands

[rinocs]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.98%. Comparing base (b30f1de) to head (0b556e2).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
plugins/util.go	90.47%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   30.70%   30.98%   +0.28%     
==========================================
  Files          59       59              
  Lines        4445     4466      +21     
==========================================
+ Hits         1365     1384      +19     
- Misses       2980     2981       +1     
- Partials      100      101       +1     

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