Test

feat: add fixed_window bucket option #89

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Run time

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Job	Run time
test (14.x)	51s
test (14.x)	52s
test (16.x)	36s
test (16.x)	48s
test (18.x)	40s
test (18.x)	47s
test (20.x)	49s
test (20.x)	36s
	5m 59s