Merge branch '04-03-association_log_verification' of github.com:xmtp/libxmtp into 04-03-association_log_verification

Author: neekolas

xmtp_id/src/associations/association_log.rs

@@ -105,6 +105,12 @@ impl IdentityAction for AddAssociation {
             ));
         }
 
+        if new_member_address.ne(&self.new_member_identifier) {
+            return Err(AssociationError::Generic(
+                "new member identifier does not match signature".to_string(),
+            ));
+        }
+
         // You cannot add yourself
         if new_member_address == existing_member_identifier {
             return Err(AssociationError::Generic("tried to add self".to_string()));