test: fuzz testing with cargo-fuzz

[ferbetanzo]

This is not intended to be merged as it includes some changes to hugr-model and the devenv.

Please check the README.md for how to run the fuzzing targets.

[codecov]

Codecov Report

❌ Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.58%. Comparing base (b4e0510) to head (89d1579).

Files with missing lines	Patch %	Lines
hugr-model/src/v0/ast/mod.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2316      +/-   ##
==========================================
- Coverage   83.39%   82.58%   -0.81%     
==========================================
  Files         259      246      -13     
  Lines       50741    44574    -6167     
  Branches    46264    40097    -6167     
==========================================
- Hits        42313    36811    -5502     
+ Misses       6061     5786     -275     
+ Partials     2367     1977     -390     

Flag	Coverage Δ
python	91.53% <ø> (ø)

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