Add copy option in DataTree.from_dict #13129

Job	Run time
Event File	2s
detect ci trigger	3s
ubuntu-latest py3.9	8m 0s
ubuntu-latest py3.12	9m 25s
macos-latest py3.9	5m 12s
macos-latest py3.12	6m 26s
windows-latest py3.9	16m 36s
windows-latest py3.12	16m 53s
ubuntu-latest py3.9 bare-minimum	1m 34s
ubuntu-latest py3.9 min-all-deps	6m 46s
ubuntu-latest py3.11 all-but-dask	6m 13s
ubuntu-latest py3.12 flaky	1m 13s
	1h 18m 23s

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