Fix to_record_batches default order and add TaskOrder import

- Import TaskOrder from pyiceberg.table in pyarrow.py
- Change to_record_batches signature to use TaskOrder() as default
  instead of None, ensuring consistent default scan ordering behavior

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sumedhsakdeo

pyiceberg/io/pyarrow.py

@@ -144,7 +144,7 @@
     visit,
     visit_with_partner,
 )
-from pyiceberg.table import DOWNCAST_NS_TIMESTAMP_TO_US_ON_WRITE, ArrivalOrder, ScanOrder, TableProperties
+from pyiceberg.table import DOWNCAST_NS_TIMESTAMP_TO_US_ON_WRITE, ArrivalOrder, ScanOrder, TableProperties, TaskOrder
 from pyiceberg.table.locations import load_location_provider
 from pyiceberg.table.metadata import TableMetadata
 from pyiceberg.table.name_mapping import NameMapping, apply_name_mapping
@@ -1837,7 +1837,7 @@ def to_table(self, tasks: Iterable[FileScanTask]) -> pa.Table:
     def to_record_batches(
         self,
         tasks: Iterable[FileScanTask],
-        order: ScanOrder | None = None,
+        order: ScanOrder = TaskOrder(),
     ) -> Iterator[pa.RecordBatch]:
         """Scan the Iceberg table and return an Iterator[pa.RecordBatch].