Update prefetcher to increment client read window linearly with each read #3457

Job	Run time
Integration / Address sanitizer	7m 24s
Integration / fstab tests (AL2 arm	2m 26s
Integration / fstab tests (Ubuntu x86	3m 20s
Integration / FS Tests (S3XOZ, Ubuntu x86, FUSE 2)	9m 31s
Integration / FS Tests (S3, AL2 arm, FUSE 2)	7m 3s
Integration / FS Tests (S3, Ubuntu x86, FUSE 3)	9m 28s
Integration / FS Tests (S3, Ubuntu x86, FUSE 2)	10m 23s
Integration / Client Tests (S3, Ubuntu x86, Test Pool)	5m 54s
Integration / Client Tests (S3, Ubuntu x86, Default Pool)	6m 45s
Integration / FS Tests (S3XOZ, Ubuntu x86, FUSE 3)	11m 39s
Integration / Client Tests (S3, AL2 arm, Default Pool)	4m 58s
Integration / Client Tests (S3XOZ, AL2 arm, Default Pool)	3m 41s
Integration / Client Tests (S3, AL2 arm, Test Pool)	4m 50s
Integration / Client Tests (S3, AL2 arm, FS Pool)	4m 47s
Integration / Client Tests (S3XOZ, Ubuntu x86, Test Pool)	5m 25s
Integration / Client Tests (S3XOZ, AL2 arm, Test Pool)	3m 40s
Integration / FS Tests (S3XOZ, AL2 arm, FUSE 2)	7m 23s
Integration / Client Tests (S3XOZ, Ubuntu x86, Default Pool)	4m 18s
Integration / Client Tests (S3, Ubuntu x86, FS Pool)	5m 38s
Integration / Client Tests (S3XOZ, AL2 arm, FS Pool)	3m 38s
Integration / Client Tests (S3XOZ, Ubuntu x86, FS Pool)	4m 4s
	2h 6m 15s

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