Zero fee commitment test vectors

[carlaKC]

Needs some serious cleaning up, so please don't review yet!

Opening up early because I'll be out till the 10th, want to have a passing version of these up in the meantime.

[ldk-reviews-bot]

👋 Thanks for assigning @tankyleo as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.29%. Comparing base (3f96d12) to head (83a1f30).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4202      +/-   ##
==========================================
+ Coverage   89.28%   89.29%   +0.01%     
==========================================
  Files         180      180              
  Lines      137913   137913              
  Branches   137913   137913              
==========================================
+ Hits       123134   123154      +20     
+ Misses      12163    12149      -14     
+ Partials     2616     2610       -6     

Flag	Coverage Δ
fuzzing	33.49% <ø> (+1.87%)	⬆️
tests	88.69% <ø> (-0.01%)	⬇️

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[ldk-reviews-bot]

🔔 1st Reminder

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Please take a look when you have a chance. If you're unable to review, please let us know so we can find another reviewer.

[ldk-reviews-bot]

🔔 2nd Reminder

Hey @tankyleo! This PR has been waiting for your review.
Please take a look when you have a chance. If you're unable to review, please let us know so we can find another reviewer.

[ldk-reviews-bot]

🔔 3rd Reminder

Hey @tankyleo! This PR has been waiting for your review.
Please take a look when you have a chance. If you're unable to review, please let us know so we can find another reviewer.