* refactor NIFSTrait interface to fit Nova variants (Nova,Mova,Ova)

  Refactor NIFSTrait interface to fit Nova variants (Nova,Mova,Ova). The relevant
  change is instead of passing the challenge as input, now it passes the
  transcript and computes the challenges internally (Nova & Ova still compute a
  single challenge, but Mova computes multiple while absorbing at different
  steps).

* port Mova impl to the NIFSTrait

* remove unnecessary wrappers in the nova/zk.rs

* remove Nova NIFS methods that are no longer needed after the refactor

* put together the different NIFS implementations (Nova, Mova, Ova) so
  that they can interchanged at usage.

The idea is that Nova and its variants (Ova & Mova) share most of the
logic for the circuits & IVC & Deciders, so with the abstracted NIFS
interface we will be able to reuse most of the already existing Nova
code for having the Mova & Ova circuits, IVC, and Decider.