feat: add ensure_ok for simple 20/non-20 matching

src/response.rs

@@ -1,4 +1,4 @@
-use crate::{status::Status, LibError};
+use crate::{status::Status, LibError, ReplyType};
 
 use bytes::Bytes;
 use tokio::io::AsyncReadExt;
@@ -21,6 +21,14 @@ impl Response {
         }
     }
 
+    pub fn ensure_ok(self: Self) -> Result<Self, Self> {
+        if self.status.reply_type() == ReplyType::Success {
+            Ok(self)
+        } else {
+            Err(self)
+        }
+    }
+
     pub fn status(self: &Self) -> Status {
         self.status
     }