Add bls precompile benchmark generator, benchmarks (state tests) using inputs from https://github.com/jwasinger/eip2537-evm-benchmarks

[jwasinger]

Not meant to be merged. Opening here for visibility in case other clients want an apples-to-apples comparison of bls precompiles with equivalent inputs.

[holiman]

Odd conflicts.. ? Are you working on a very old branch, for some reason?

[jwasinger]

I updated Geth and added gnark, which I guess broke a ton of stuff. There's a lot of randomly commented-out code where things broke, because originally I just wanted to get this to a state where it would build.

Also, there's leftover cruft from where I was trying to get this to run cross-client state test benchmarks before you explained how impractical it is.