feat: add support for --save-exact

[anonrig]

No description provided.

[codecov-commenter]

Codecov Report

Merging #31 (2199d61) into main (f1d5b2f) will increase coverage by 0.56%.
The diff coverage is 67.64%.

❗ Current head 2199d61 differs from pull request most recent head bc25454. Consider uploading reports for the commit bc25454 to get more accurate results

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
+ Coverage   65.27%   65.83%   +0.56%     
==========================================
  Files          16       16              
  Lines         815      843      +28     
==========================================
+ Hits          532      555      +23     
- Misses        283      288       +5     

Files Changed	Coverage Δ
crates/cli/src/commands.rs	22.22% <0.00%> (-2.78%)	⬇️
crates/cli/src/lib.rs	65.90% <0.00%> (-3.14%)	⬇️
crates/registry/src/lib.rs	0.00% <0.00%> (ø)
crates/registry/src/package.rs	70.78% <100.00%> (+10.18%)	⬆️