Smash the singular Ciphersuite trait into multiple

This helps identify where the various functionalities are used, or rather, not
used. The `Ciphersuite` trait present in `patches/ciphersuite`, facilitating
the entire FCMP++ tree, only requires the markers _and_ canonical point
decoding. I've opened a PR to upstream such a trait into `group`
(https://github.com/zkcrypto/group/pull/68).

`WrappedGroup` is still justified for as long as `Group::generator` exists.
Moving `::generator()` to its own trait, on an independent structure (upstream)
would be massively appreciated. @tarcieri also wanted to update from
`fn generator()` to `const GENERATOR`, which would encourage further discussion
on https://github.com/zkcrypto/group/issues/32 and
https://github.com/zkcrypto/group/issues/45, which have been stagnant.

The `Id` trait is occasionally used yet really should be first off the chopping
block.

Finally, `WithPreferredHash` is only actually used around a third of the time,
which more than justifies it being a separate trait.

---

Updates `dalek_ff_group::Scalar` to directly re-export
`curve25519_dalek::Scalar`, as without issue. `dalek_ff_group::RistrettoPoint`
also could be replaced with an export of `curve25519_dalek::RistrettoPoint`,
yet the coordinator relies on how we implemented `Hash` on it for the hell of
it so it isn't worth it at this time. `dalek_ff_group::EdwardsPoint` can't be
replaced for an re-export of `curve25519_dalek::SubgroupPoint` as it doesn't
implement `zeroize`, `subtle` traits within a released, non-yanked version.
Relevance to https://github.com/serai-dex/serai/issues/201 and
https://github.com/dalek-cryptography/curve25519-dalek/issues/811#issuecomment-3247732746.

Also updates the `Ristretto` ciphersuite to prefer `Blake2b-512` over
`SHA2-512`. In order to maintain compliance with FROST's IETF standard,
`modular-frost` defines its own ciphersuite for Ristretto which still uses
`SHA2-512`.

tests/processor/src/lib.rs

@@ -6,7 +6,7 @@ use zeroize::Zeroizing;
 
 use ciphersuite::{
   group::{ff::PrimeField, GroupEncoding},
-  Ciphersuite,
+  WrappedGroup,
 };
 use ciphersuite_kp256::Secp256k1;
 use dalek_ff_group::{Ed25519, Ristretto};
@@ -40,7 +40,7 @@ pub fn processor_instance(
   name: &str,
   network: ExternalNetworkId,
   port: u32,
-  message_queue_key: <Ristretto as Ciphersuite>::F,
+  message_queue_key: <Ristretto as WrappedGroup>::F,
 ) -> (Vec<TestBodySpecification>, EvrfPublicKeys) {
   let substrate_evrf_key =
     insecure_arbitrary_key_from_name::<<Ristretto as EvrfCurve>::EmbeddedCurve>(name);
@@ -113,7 +113,7 @@ pub fn processor_instance(
 }
 
 pub struct ProcessorKeys {
-  coordinator: <Ristretto as Ciphersuite>::F,
+  coordinator: <Ristretto as WrappedGroup>::F,
   evrf: EvrfPublicKeys,
 }
 

tests/processor/src/networks.rs

@@ -1,6 +1,8 @@
 use zeroize::Zeroizing;
 use rand_core::{RngCore, OsRng};
 
+use ciphersuite::{WrappedGroup, GroupIo};
+
 use scale::Encode;
 
 use serai_client::{
@@ -90,7 +92,7 @@ pub enum Wallet {
   },
   Ethereum {
     rpc_url: String,
-    key: <ciphersuite::Secp256k1 as Ciphersuite>::F,
+    key: <ciphersuite::Secp256k1 as WrappedGroup>::F,
     nonce: u64,
   },
   Monero {
@@ -158,9 +160,9 @@ impl Wallet {
           network::Ethereum,
         };
 
-        let key = <Secp256k1 as Ciphersuite>::F::random(&mut OsRng);
+        let key = <Secp256k1 as WrappedGroup>::F::random(&mut OsRng);
         let address =
-          ethereum_serai::crypto::address(&(<Secp256k1 as Ciphersuite>::generator() * key));
+          ethereum_serai::crypto::address(&(<Secp256k1 as WrappedGroup>::generator() * key));
 
         let provider = RootProvider::<_, Ethereum>::new(
           ClientBuilder::default().transport(SimpleRequest::new(rpc_url.clone()), true),
@@ -321,7 +323,7 @@ impl Wallet {
         ));
 
         let to_as_key = PublicKey::new(
-          <ciphersuite::Secp256k1 as Ciphersuite>::read_G(&mut to.as_slice()).unwrap(),
+          <ciphersuite::Secp256k1 as GroupIo>::read_G(&mut to.as_slice()).unwrap(),
         )
         .unwrap();
         let router_addr = {