Compare efficiency of different approaches for hash2curve for the case of BLS12-377

[drskalman]

Specifically comparing

• Wahby, R. S., & Boneh, D. (2019). Fast and simple constant-time
  hashing to the bls12-381 elliptic curve. IACR Transactions on
  Cryptographic Hardware and Embedded Systems, nil(nil), 154–179.
  http://dx.doi.org/10.46586/tches.v2019.i4.154-179

• Koshelev, D. (2021). Indifferentiable hashing to ordinary elliptic
  f_$\backslash$!q-curves of j= 0 with the cost of one exponentiation
  in f_$\backslash$!q. IACR Cryptol. ePrint Arch., 2021(), 301.

• Koshelev, D. (2021). Faster indifferentiable hashing to elliptic
  $$\backslash$mathbb $$F$$ _ $$$\backslash$! q^ 2$$ $-curves.
  Cryptology ePrint Archive, (), .