fix: add functions for data uris

Author: rustyconover

src/query_farm_server_base/flight_handling.py

@@ -1,4 +1,5 @@
 import base64
+import io
 import json
 from collections.abc import Callable, Generator
 from dataclasses import dataclass
@@ -78,6 +79,13 @@ def endpoint(
     )
 
 
+def serialize_arrow_ipc_table(table: pa.Table) -> bytes:
+    sink = io.BytesIO()
+    with pa.ipc.new_stream(sink, table.schema) as writer:
+        writer.write_table(table)
+    return sink.getvalue()
+
+
 def dict_to_msgpack_data_uri(data: dict[str, Any]) -> str:
     """
     Convert a dictionary to a data URI with MessagePack encoding.