Bundle Command

[PaulKMueller]

Motivation

Software bills of material are quite common and important when selling software (packages).
The bundle command makes the creation of such bills easier by allowing for the bundling of all license files contained in dependency packages.

Changes

This PR adds the bundle command, e.g.:

conda-deny bundle --directory license-bundle

Closes #33

[codecov]

Codecov Report

Attention: Patch coverage is 80.83832% with 32 lines in your changes missing coverage. Please review.

Project coverage is 82.00%. Comparing base (19fd4d4) to head (c385267).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bundle.rs	79.33%	31 Missing ⚠️
src/main.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   81.54%   82.00%   +0.46%     
==========================================
  Files          12       13       +1     
  Lines         558      717     +159     
==========================================
+ Hits          455      588     +133     
- Misses        103      129      +26     

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[pavelzw]

mostly looks good, some small comments