support for user settings

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.28507% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 94.51%. Comparing base (85f45ff) to head (ae38f35).

Files	Patch %	Lines
src/whl2conda/settings.py	96.12%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #146 +/- ## ========================================== + Coverage 94.14% 94.51% +0.37% ========================================== Files 19 20 +1 Lines 1555 1770 +215 ========================================== + Hits 1464 1673 +209 - Misses 91 97 +6 ```

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