arrow-buffer: add i256::trailing_zeros #15482

Job	Run time
Archery test With other arrows	18m 40s
Pyarrow C Data Interface (stable, 16)	1m 22s
Pyarrow C Data Interface (stable, 15)	1m 31s
Pyarrow C Data Interface (stable, 17)	1m 21s
	22m 54s

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