Support downloading of wheel to convert (#37)

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (cf95b41) 82.46% compared to head (1bc8eca) 82.73%. Report is 1 commits behind head on main.

Files	Patch %	Lines
src/whl2conda/cli/convert.py	92.50%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #121 +/- ## ========================================== + Coverage 82.46% 82.73% +0.27% ========================================== Files 19 20 +1 Lines 1853 1900 +47 ========================================== + Hits 1528 1572 +44 - Misses 325 328 +3 ```

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