* avoid creating commitments to zero vectors

* reduce the number of constraints in each iteration from 4 to 3

* rename methods for better clarity

* rename

* Bump version

use a default implementation for step circuit

* support multiple iterations of MinRoot per Nova step

* small edits to println

* fix declaration

* add the MinRoot VDF example

* optimize a bit

* optimization and cleanup

* clippy

* add examples to CI

* use inbuilt pow_vartime