Test

Implement support for `structured` and `struct` zarr-extension defined dtypes #6830

Job	Run time
Benchmark smoke test	9m 31s
py=3.14-upstream	11m 19s
py=3.12-min_deps	7m 5s
doctests	1m 1s
os=ubuntu-latest, py=3.13, deps=minimal	6m 16s
os=ubuntu-latest, py=3.12, deps=minimal	5m 35s
os=ubuntu-latest, py=3.12, deps=optional	7m 11s
os=ubuntu-latest, py=3.14, deps=optional	8m 6s
os=windows-latest, py=3.12, deps=optional	9m 21s
os=ubuntu-latest, py=3.14, deps=minimal	6m 24s
os=macos-latest, py=3.12, deps=optional	5m 40s
os=windows-latest, py=3.14, deps=optional	8m 17s
os=ubuntu-latest, py=3.13, deps=optional	7m 38s
os=macos-latest, py=3.14, deps=optional	5m 31s
Test complete	4s
	1h 38m 59s

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