Add more native bls benchmarks

[jwasinger]

Currently, our benchmark set only measure several input sizes for msm and pairing. This introduces more comprehensive benchmarks with a wider-variety of input sizes.

For pairing, inputs are random points (which is the worst-case for gnark's implementation). For msm, inputs are random points and scalars whose binary representation is all 1s (0xfff..fff)

[jwasinger]

I've duplicated the benchmarks into their own files to make them easier to run standalone. But these will be removed before merging.

[jwasinger]

I need to fill in gas values as well...

[jwasinger]

If we want, I can include the generator for these (and the others I am about to add) as part of this PR.

[jwasinger]

So actually, the only precompiles we are really lacking benchmark coverage for are MSM. Previous to this we only benchmark the following input pair counts: 1, 3, 16 25.

The new benchmarks cover pair counts 1..32, 64, 128 , 512, 1024, 2048 and 4877 (the size of the fuzzer-found worst-case input that fits in a 10mil gas block).

[jwasinger]

IMO, this is now ready for merge.