#105: add progress bar for plugin installation

[kcmvp]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 67.80%. Comparing base (b5688b3) to head (70b5ccc).

Files	Patch %	Lines
cmd/gbc/artifact/plugin.go	44.44%	3 Missing and 2 partials ⚠️
cmd/gbc/command/build_action.go	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #106      +/-   ##
==========================================
- Coverage   67.89%   67.80%   -0.10%     
==========================================
  Files          21       21              
  Lines        1165     1171       +6     
==========================================
+ Hits          791      794       +3     
- Misses        314      316       +2     
- Partials       60       61       +1     

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