feat(boss): add new command to scaffold project and package templates (issue #67)

[isaquepinheiro]

This PR adds the boss new command to generate clean skeleton templates for packages and projects directly from the CLI.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 54.66667% with 34 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@0f2a917). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
internal/adapters/primary/cli/new.go	55.40%	18 Missing and 15 partials ⚠️
internal/adapters/primary/cli/root.go	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #254   +/-   ##
=======================================
  Coverage        ?   26.18%           
=======================================
  Files           ?       83           
  Lines           ?     3899           
  Branches        ?        0           
=======================================
  Hits            ?     1021           
  Misses          ?     2789           
  Partials        ?       89           

Flag	Coverage Δ
unittests	26.18% <54.66%> (?)

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