Wrap constraints with ID into ConstraintEntry

[adamchalmers]

Instead of relying on the order constraints come in, give each constraint an ID, and track it throughout execution.

This is going to be helpful for #147, where the order of each constraint in the constraint vec given by the user may be reordered, because the order they're in might not correspond to their prioritized order.

This should not have any effect on the public API.

[codspeed-hq]

CodSpeed Performance Report

Merging #150 will not alter performance

_{Comparing achalmers/entries (98eb0fa) with main (a7e931b)}

Summary

✅ 13 untouched

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.02%. Comparing base (a7e931b) to head (98eb0fa).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
kcl-ezpz/src/constraints.rs	0.00%	3 Missing ⚠️
kcl-ezpz/src/warnings.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
- Coverage   91.06%   91.02%   -0.04%     
==========================================
  Files          18       18              
  Lines        4533     4548      +15     
==========================================
+ Hits         4128     4140      +12     
- Misses        405      408       +3     

Flag	Coverage Δ
unittests	91.02% <90.00%> (-0.04%)	⬇️

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