add NWBHDF5IO.read_nwb() method #4

Job	Run time
conda-linux-python3.12-ros3	1m 39s
conda-linux-gallery-python3.12-ros3	1m 26s
linux-gallery-python3.8-minimum	1m 57s
linux-gallery-python3.12-upgraded	2m 23s
linux-python3.8-minimum	4m 56s
windows-gallery-python3.8-minimum	3m 30s
conda-linux-python3.8-minimum	4m 53s
linux-python3.12-upgraded	4m 51s
windows-gallery-python3.12-upgraded	3m 33s
conda-linux-python3.12-upgraded	3m 58s
windows-python3.8-minimum	5m 56s
windows-python3.12-upgraded	5m 39s
macos-python3.8-minimum	1m 8s
Deploy pre-release from dev	0s
	45m 49s

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