feat: --modules option.

[knightedcodemonkey]

• Puts transforms of module globals behind the --modules option.
• Adds test for npm monorepo (workspaces).
• Updates the docs.
• Closes 2.0.0-rc.0 copies files from dependencies within pnpm monorepo #46

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.30%. Comparing base (4815dc1) to head (4d9f9c0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   98.18%   98.30%   +0.12%     
==========================================
  Files           3        3              
  Lines         385      413      +28     
==========================================
+ Hits          378      406      +28     
  Misses          7        7              

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