chore: import upstream snapshot with attribution

haystack/components/routers/__init__.py

@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: 2022-present deepset GmbH <info@deepset.ai>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import sys
+from typing import TYPE_CHECKING
+
+from lazy_imports import LazyImporter
+
+_import_structure = {
+    "conditional_router": ["ConditionalRouter"],
+    "document_length_router": ["DocumentLengthRouter"],
+    "document_type_router": ["DocumentTypeRouter"],
+    "file_type_router": ["FileTypeRouter"],
+    "llm_messages_router": ["LLMMessagesRouter"],
+    "metadata_router": ["MetadataRouter"],
+}
+
+if TYPE_CHECKING:
+    from .conditional_router import ConditionalRouter as ConditionalRouter
+    from .document_length_router import DocumentLengthRouter as DocumentLengthRouter
+    from .document_type_router import DocumentTypeRouter as DocumentTypeRouter
+    from .file_type_router import FileTypeRouter as FileTypeRouter
+    from .llm_messages_router import LLMMessagesRouter as LLMMessagesRouter
+    from .metadata_router import MetadataRouter as MetadataRouter
+else:
+    sys.modules[__name__] = LazyImporter(name=__name__, module_file=__file__, import_structure=_import_structure)