chunk grid base class should not act as a registry

[d-v-b]

These lines from the base ChunkGrid.from_dict method have it acting as a registry. This is deeply confused. This method should be abstract, and we should use a real registry instead of this logic.

zarr-python/src/zarr/core/chunk_grids.py

Lines 163 to 166 in d926e43

	name_parsed, _ = parse_named_configuration(data)
	if name_parsed == "regular":
	return RegularChunkGrid._from_dict(data)
	raise ValueError(f"Unknown chunk grid. Got {name_parsed}.")