`tree_flatten` supports named tuples #4928

Job	Run time
pytester (ubuntu-22.04, 3.10, latest, core)	10m 5s
pytester (ubuntu-22.04, 3.10, latest, ops)	26m 23s
pytester (ubuntu-22.04, 3.10, nightly, core)	10m 11s
pytester (ubuntu-22.04, 3.10, nightly, ops)	27m 34s
pytester (macOS-14, 3.10, latest, core)	7m 21s
pytester (macOS-14, 3.10, latest, ops)	21m 50s
pytester (macOS-14, 3.10, nightly, core)	7m 2s
pytester (macOS-14, 3.10, nightly, ops)	22m 6s
pytester (windows-2022, 3.10, latest, core)	24m 32s
pytester (windows-2022, 3.10, nightly, core)	23m 32s
pytester (ubuntu-22.04, 3.11, latest)	23m 46s
pytester (ubuntu-22.04, 3.12, latest)	28m 8s
testing-guardian	1s
	3h 52m 31s

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