fix: add write_batch_size to config

this will be useful for bulk updates

Author: aMahanna

_nx_arangodb/__init__.py

@@ -81,6 +81,7 @@ def get_info():
         "db_name": None,
         "read_parallelism": None,
         "read_batch_size": None,
+        "write_batch_size": None,
     }
 
     return d

nx_arangodb/classes/graph.py

@@ -158,6 +158,7 @@ def _set_arangodb_backend_config(self) -> None:
         config.db_name = self._db_name
         config.read_parallelism = self.read_parallelism
         config.read_batch_size = self.read_batch_size
+        config.write_batch_size = self.write_batch_size
 
     def _set_factory_methods(self) -> None:
         """Set the factory methods for the graph, _node, and _adj dictionaries.