fix(core): revert From ed25519_consensus types for crypto mod (#1220)

## Summary
revert `From` ed25519_consensus types for crypto mod

## Background
We want to minimize the surface of our public astria-core API when it
comes to foreign (third party) types.

crates/astria-core/src/crypto.rs

@@ -99,12 +99,6 @@ impl<'a> From<&'a SigningKey> for VerificationKey {
     }
 }
 
-impl From<Ed25519SigningKey> for SigningKey {
-    fn from(key: Ed25519SigningKey) -> Self {
-        Self(key)
-    }
-}
-
 impl TryFrom<&[u8]> for SigningKey {
     type Error = ed25519_consensus::Error;
 
@@ -216,14 +210,6 @@ impl AsRef<[u8]> for VerificationKey {
     }
 }
 
-impl From<Ed25519VerificationKey> for VerificationKey {
-    fn from(key: Ed25519VerificationKey) -> Self {
-        Self {
-            key,
-        }
-    }
-}
-
 impl TryFrom<&[u8]> for VerificationKey {
     type Error = Error;
 
@@ -276,12 +262,6 @@ impl From<[u8; 64]> for Signature {
     }
 }
 
-impl From<Ed25519Signature> for Signature {
-    fn from(signature: Ed25519Signature) -> Self {
-        Self(signature)
-    }
-}
-
 impl TryFrom<&[u8]> for Signature {
     type Error = Error;