ssh remoting: Enable reconnecting after connection losses (#18586)

Release Notes:

- N/A

---------

Co-authored-by: Bennet <bennet@zed.dev>

crates/remote/src/protocol.rs

@@ -49,3 +49,17 @@ pub async fn write_message<S: AsyncWrite + Unpin>(
     stream.write_all(buffer).await?;
     Ok(())
 }
+
+pub async fn read_message_raw<S: AsyncRead + Unpin>(
+    stream: &mut S,
+    buffer: &mut Vec<u8>,
+) -> Result<()> {
+    buffer.resize(MESSAGE_LEN_SIZE, 0);
+    stream.read_exact(buffer).await?;
+
+    let message_len = message_len_from_buffer(buffer);
+    buffer.resize(message_len as usize, 0);
+    stream.read_exact(buffer).await?;
+
+    Ok(())
+}