feat: allow users to set default project in CLI

[devholic]

Resolves #1150

• Introduces config set and config unset to deal with CLI configuration
• Moves CLI command packages to under the internal/cli/cmd to avoid import cycle

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a569a42) 48.83% compared to head (9df650a) 48.67%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1179      +/-   ##
==========================================
- Coverage   48.83%   48.67%   -0.17%     
==========================================
  Files         115      116       +1     
  Lines        8573     8602      +29     
==========================================
  Hits         4187     4187              
- Misses       4234     4263      +29     
  Partials      152      152              

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[krancour]

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