New method circular_array_windows(). #1207

Job	Run time
miri	2m 48s
check format	7s
msrv	48s
semver-checks	12s
doc	16s
test	50s
check (--no-default-features --features use_alloc)	22s
check (--all-targets --all-features)	20s
check	9s
check (--no-default-features)	15s
All checks succeeded	0s
	6m 7s

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