Finish routing the new key gen in the processor

Doesn't touch the tests, coordinator, nor Substrate yet.
`cargo +nightly fmt && cargo +nightly-2024-07-01 clippy --all-features -p serai-processor`
does pass.

crypto/evrf/divisors/src/lib.rs

@@ -15,10 +15,7 @@ pub use poly::*;
 mod tests;
 
 /// A curve usable with this library.
-pub trait DivisorCurve: Group
-where
-  Self::Scalar: PrimeField,
-{
+pub trait DivisorCurve: Group {
   /// An element of the field this curve is defined over.
   type FieldElement: PrimeField;