Transcript crate with both a merlin backend and a basic label len value backend

Moves binding factor/seeded RNGs over to the transcripts.

crypto/frost/src/lib.rs

@@ -1,10 +1,10 @@
 use core::{ops::Mul, fmt::Debug};
 
+use thiserror::Error;
+
 use ff::{Field, PrimeField};
 use group::{Group, GroupOps, ScalarMul};
 
-use thiserror::Error;
-
 pub mod key_gen;
 pub mod algorithm;
 pub mod sign;