feat: adding data system option to create file datasource intializer

Author: joker23

ldclient/datasystem.py

@@ -16,6 +16,9 @@
     StreamingDataSource,
     StreamingDataSourceBuilder
 )
+from ldclient.impl.integrations.files.file_data_sourcev2 import (
+    _FileDataSourceV2
+)
 from ldclient.interfaces import (
     DataStoreMode,
     FeatureStore,
@@ -125,6 +128,12 @@ def builder(config: LDConfig) -> StreamingDataSource:
     return builder
 
 
+def file_ds_builder(paths: List[str]) -> Builder[Initializer]:
+    def builder(_: LDConfig) -> Initializer:
+        return _FileDataSourceV2(paths)
+
+    return builder
+
 def default() -> ConfigBuilder:
     """
     Default is LaunchDarkly's recommended flag data acquisition strategy.