Remove AVX backend

[andrewmilson]

This change is 

[andrewmilson]

• Add eval order and interpolate to SecureEvaluation #794
• Add MLE eval constraints #742
• Add eq evals constraints #741
• Add benchmarks for GKR lookups #673
• Implement LogupOps for SIMD backend #641
• Implement GrandProductOps for SIMD backend #640
• Implement GkrOps for SIMD backend #630
• Implement MleOps for SIMD backend #629
• Add GKR implementation of Logup lookups #623
• Add GKR implementation of Grand Product lookups #620
• Implement GkrOps for CPU backend #621
• Add batch GKR prover and verifier #581
• Rename CPU* structs to Cpu* to conform to Rust's naming convention #617
• Remove AVX backend #616 👈
• Convert wide_fibbonacci AVX backend example to SIMD backend #615
• Update CI to test Wasm simd128, avx2 and aarch64 neon #614
• Fix CirclePointIndex bug in debug mode for 32-bit archs #613
• Change opt-level in benchmarks script #612
• Add benchmarks for SIMD m31 #611
• Add benchmarks for SIMD merkle #610
• dev

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.64%. Comparing base (23d2946) to head (50a6982).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #616      +/-   ##
==========================================
- Coverage   93.06%   92.64%   -0.43%     
==========================================
  Files          84       69      -15     
  Lines       11909     8995    -2914     
  Branches    11909     8995    -2914     
==========================================
- Hits        11083     8333    -2750     
+ Misses        744      590     -154     
+ Partials       82       72      -10     

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[spapinistarkware]

Please wait until the merkle simd benchmark is good

Reviewable status: 0 of 25 files reviewed, all discussions resolved