chore: improve DatabaseError error messages

Author: DaniPopes

crates/cheatcodes/src/json.rs

@@ -192,7 +192,7 @@ impl Cheatcode for serializeBytes32_0Call {
 impl Cheatcode for serializeString_0Call {
     fn apply(&self, state: &mut Cheatcodes) -> Result {
         let Self { objectKey, valueKey, value } = self;
-        serialize_json(state, objectKey, Some(valueKey), &value.to_string())
+        serialize_json(state, objectKey, Some(valueKey), value)
     }
 }
 

crates/evm/core/src/backend/error.rs

@@ -15,11 +15,11 @@ pub type DatabaseResult<T> = Result<T, DatabaseError>;
 pub enum DatabaseError {
     #[error("{0}")]
     Message(String),
-    #[error("no cheats available for {0}")]
+    #[error("cheatcodes are not enabled for {0}; see `vm.allowCheatcodes(address)`")]
     NoCheats(Address),
-    #[error("failed to fetch AccountInfo {0}")]
+    #[error("failed to fetch account info for {0}")]
     MissingAccount(Address),
-    #[error("code should already be loaded: {0}")]
+    #[error("missing bytecode for code hash {0}")]
     MissingCode(B256),
     #[error(transparent)]
     Recv(#[from] RecvError),