chore: Add script to recompile the ECC sets

[aborgna-q]

• Moves the loose ECC files into test_files/eccs
• Adds a just recompile-eccs command / script to regenerate the .rwr files.

Note that the compilation is not deterministic, so we should avoid running it unless needed to avoid bloating the git history.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.49%. Comparing base (54564fc) to head (f9cffc1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #514   +/-   ##
=======================================
  Coverage   83.49%   83.49%           
=======================================
  Files          64       64           
  Lines        6647     6648    +1     
  Branches     6126     6127    +1     
=======================================
+ Hits         5550     5551    +1     
  Misses        817      817           
  Partials      280      280           

Flag	Coverage Δ
python	96.73% <ø> (ø)
rust	82.37% <100.00%> (+<0.01%)	⬆️

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[doug-q]

Looks good, with a few shell nits. I recommend adding .gitattributes to test_files/eccs with * -diff to mark these files as binary

[aborgna-q]

I went with binary instead of -diff, as it also unsets merge and text