[v3] deleting a group does not delete subgroups

[dcherian]

Zarr version

3

Numcodecs version

?

Python Version

?

Operating System

?

Installation

?

Description

deleting a group does not delete subgroups.

Discovered in #2189

Steps to reproduce

import zarr
from zarr.store import MemoryStore

store = MemoryStore(mode="w")
g1 = zarr.group(store=store)
g1.create_group("0")
g1.create_group("0/0")
del g1["0"]
g1["0/0"] # succeeds

Additional output

No response

[zoj613]

Looks like the MemoryStore implementation is missing a erase_prefix function to allow proper deletion of a group and its children.

[jhamman]

I have a fix for this in the works.