added hash.rs, updated imports

[nicolaassolini-qntm]

No description provided.

[hugrbot]

Hey there and thank you for opening this pull request! 👋

We follow the Conventional Commits convention for PR titles. It looks like your title needs some adjustment.

The title should have a type prefix, followed by a colon. The most important ones are:

• feat: for new features
• fix: for bug fixes

If the PR contains a breaking change, use feat!: or fix!: instead and include a "BREAKING CHANGE:" footer in the description of the pull request.

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• feat: New feature
• fix: Bug fix
• docs: Documentation-only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc)
• refactor: A code change that neither fixes a bug nor adds a feature
• perf: Performance improvements
• test: Adding missing or correcting existing tests
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• chore: Other changes that do not alter public APIs or code behaviour
• revert: Reverts a previous commit

[codecov]

Codecov Report

❌ Patch coverage is 77.72512% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.62%. Comparing base (25f1ae0) to head (f749680).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
hugr-passes/src/utils.rs	71.87%	24 Missing and 3 partials ⚠️
hugr-passes/src/hash.rs	81.65%	8 Missing and 12 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2840      +/-   ##
==========================================
- Coverage   83.64%   83.62%   -0.02%     
==========================================
  Files         261      263       +2     
  Lines       52840    53047     +207     
  Branches    47372    47579     +207     
==========================================
+ Hits        44198    44361     +163     
- Misses       6253     6282      +29     
- Partials     2389     2404      +15     

Flag	Coverage Δ
python	87.98% <ø> (ø)

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