Test

Implement support for `structured` and `struct` zarr-extension defined dtypes #6466

Job	Run time
py=3.13-upstream	18m 47s
py=3.11-min_deps	18m 31s
doctests	56s
os=ubuntu-latest, py=3.12, deps=optional	12m 16s
os=ubuntu-latest, py=3.13, deps=optional	12m 16s
os=ubuntu-latest, py=3.11, deps=minimal	12m 15s
os=ubuntu-latest, py=3.13, deps=minimal	12m 16s
os=windows-latest, py=3.13, deps=optional	12m 11s
os=ubuntu-latest, py=3.12, deps=minimal	12m 16s
os=macos-latest, py=3.13, deps=optional	12m 18s
os=ubuntu-latest, py=3.11, deps=optional	12m 16s
os=windows-latest, py=3.11, deps=optional	12m 11s
os=macos-latest, py=3.11, deps=optional	11m 58s
Test complete	5s
	2h 40m 32s

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