refactor: TableScan retrieves manifests concurrently and process their entries in parallel

Author: sdd

crates/iceberg/src/error.rs

@@ -337,6 +337,12 @@ define_from_err!(
     "Failed to send a message to a channel"
 );
 
+define_from_err!(
+    tokio::task::JoinError,
+    ErrorKind::Unexpected,
+    "Failed to join a task"
+);
+
 define_from_err!(std::io::Error, ErrorKind::Unexpected, "IO Operation failed");
 
 /// Helper macro to check arguments.