EIP-2537 BLS12 381 Precompiles

Documentation for tests/prague/eip2537_bls_12_381_precompiles@tests-bal@v5.7.0.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/prague/eip2537_bls_12_381_precompiles --fork Amsterdam

Tests EIP-2537: Precompile for BLS12-381 curve operations.