migrate group metadata logic to its own module

Author: d-v-b

src/zarr/api/asynchronous.py

@@ -25,11 +25,15 @@
 )
 from zarr.core.group import (
     AsyncGroup,
+    create_hierarchy,
+)
+from zarr.core.metadata import (
+    ArrayMetadataDict,
+    ArrayV2Metadata,
+    ArrayV3Metadata,
     ConsolidatedMetadata,
     GroupMetadata,
-    create_hierarchy,
 )
-from zarr.core.metadata import ArrayMetadataDict, ArrayV2Metadata, ArrayV3Metadata
 from zarr.core.metadata.v2 import _default_compressor, _default_filters
 from zarr.errors import NodeTypeValidationError
 from zarr.storage._common import make_store_path

src/zarr/core/array.py

@@ -66,6 +66,7 @@
     product,
 )
 from zarr.core.config import config as zarr_config
+from zarr.core.group import AsyncGroup
 from zarr.core.indexing import (
     BasicIndexer,
     BasicSelection,
@@ -98,6 +99,7 @@
     ArrayV2MetadataDict,
     ArrayV3Metadata,
     ArrayV3MetadataDict,
+    GroupMetadata,
     T_ArrayMetadata,
 )
 from zarr.core.metadata.v2 import (
@@ -123,7 +125,6 @@
 
     from zarr.abc.codec import CodecPipeline
     from zarr.codecs.sharding import ShardingCodecIndexLocation
-    from zarr.core.group import AsyncGroup
     from zarr.storage import StoreLike
 
 
@@ -3738,8 +3739,6 @@ async def chunks_initialized(
 def _build_parents(
     node: AsyncArray[ArrayV2Metadata] | AsyncArray[ArrayV3Metadata] | AsyncGroup,
 ) -> list[AsyncGroup]:
-    from zarr.core.group import AsyncGroup, GroupMetadata
-
     store = node.store_path.store
     path = node.store_path.path
     if not path: