implement batch KZG for univariate

[zhenfeizhang]

This is a naive approach, do we want to add a TODO to implement the more efficient batch opening algorithm? (e.g., the appendix C.4 in https://eprint.iacr.org/2020/1536.pdf)

_Originally posted by @chancharles92 in https://github.com/EspressoSystems/hyperplonk/pull/43#discussion_r926046170_

[chancharles92]

Move to issue #52 instead