Import and fetch specified urls

[quambene]

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

[codecov[bot]]

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 :warning:
src/cmd/import.rs	94.69%	7 Missing :warning:
src/args.rs	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ 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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