Optimize bn254

[jotabulacios]

BN254 optimization

Description

This PR improves the paring performance by using optimized operations used in key functions.
Also it incorporates benches for the BN254.

There is still room for improvement optimizng the Miller loop and the operations for Fp6 and Fp12

Optimized algorithms:

• Line

• final exponentiation

  • cyclotomic_square
  • cyclotomic_pow

• Fp2 operations

Type of change

• Optimization

Benches

• Actual
  Ate pairing : 1.6898 ms
  Miller loop : 540.37 µs
  Final exponentiation: 771.49 µs

• New version
  Ate pairing :939.71 µs
  Miller loop : 375.96 µs
  Final exponentiation: 347.71 µs

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.34078% with 31 lines in your changes missing coverage. Please review.

Project coverage is 72.72%. Comparing base (8133ae5) to head (dcd29f7).

Files with missing lines	Patch %	Lines
...short_weierstrass/curves/bn_254/field_extension.rs	84.02%	23 Missing ⚠️
...c_curve/short_weierstrass/curves/bn_254/pairing.rs	96.26%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #899      +/-   ##
==========================================
- Coverage   72.82%   72.72%   -0.10%     
==========================================
  Files         150      150              
  Lines       34151    34498     +347     
==========================================
+ Hits        24870    25090     +220     
- Misses       9281     9408     +127     

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[ColoCarletti]

LGTM!