Batch Schnorr DLEQ verification #13
Description
We no reason to do this before the move to ZEXE based upon https://github.com/scipr-lab/zexe/issues/165#issuecomment-609440483
We should support extra message verification here too ala 4abb609#diff-1bab8b9043b0679190b055084e76257cR514 and add this support into schnorrkel.