add NWBHDF5IO.read_nwb() method #1444

Job	Run time
conda-linux-gallery-python3.12-ros3	1m 24s
linux-gallery-python3.8-minimum	2m 9s
conda-linux-python3.12-ros3	1m 31s
linux-gallery-python3.12-upgraded	3m 16s
windows-gallery-python3.8-minimum	3m 30s
linux-python3.8-minimum	7m 24s
windows-gallery-python3.12-upgraded	5m 20s
linux-python3.12-upgraded	7m 16s
windows-python3.8-minimum	7m 37s
windows-python3.12-upgraded	7m 41s
conda-linux-python3.8-minimum	6m 51s
macos-python3.8-minimum	11m 19s
conda-linux-python3.12-upgraded	5m 27s
Deploy pre-release from dev	0s
	1h 10m 45s

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