Add overwrite option

[gadomski]

Related issues and pull requests

• Closes Add "skip if existing" option #57

Checklist

• Add tests
• Add docs
• Update CHANGELOG

[codecov-commenter]

Codecov Report

Patch coverage: 91.66% and project coverage change: +0.06% 🎉

Comparison is base (1b3b7f0) 81.06% compared to head (20c24e4) 81.13%.

❗ Current head 20c24e4 differs from pull request most recent head 5094d9d. Consider uploading reports for the commit 5094d9d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
+ Coverage   81.06%   81.13%   +0.06%     
==========================================
  Files          16       16              
  Lines         734      742       +8     
==========================================
+ Hits          595      602       +7     
- Misses        139      140       +1     

Files Changed	Coverage Δ
src/stac_asset/_cli.py	88.18% <75.00%> (-0.43%)	⬇️
src/stac_asset/_download.py	87.50% <100.00%> (+0.18%)	⬆️
src/stac_asset/config.py	97.61% <100.00%> (+0.11%)	⬆️

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