Import and fetch specified urls

[quambene]

• added
  • Implement bogrep import --urls <URLs> (import specified URLs)
  • Implement bogrep fetch --urls <URLs> (fetch specified URLs)

[codecov]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (b08d65a) 92.31% compared to head (0534764) 91.59%.

Files	Patch %	Lines
src/cmd/fetch.rs	27.77%	26 Missing ⚠️
src/cmd/import.rs	94.69%	7 Missing ⚠️
src/args.rs	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   92.31%   91.59%   -0.72%     
==========================================
  Files          26       26              
  Lines        3303     3401      +98     
==========================================
+ Hits         3049     3115      +66     
- Misses        254      286      +32     

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