Add copy option in DataTree.from_dict #13302

Job	Run time
Event File	3s
detect ci trigger	8s
ubuntu-latest py3.9	8m 5s
ubuntu-latest py3.12	9m 37s
macos-latest py3.9	4m 59s
macos-latest py3.12	6m 17s
windows-latest py3.9	16m 43s
windows-latest py3.12	17m 52s
ubuntu-latest py3.9 bare-minimum	1m 41s
ubuntu-latest py3.9 min-all-deps	6m 51s
ubuntu-latest py3.11 all-but-dask	6m 22s
ubuntu-latest py3.12 flaky	1m 20s
	1h 19m 58s

Provide feedback