Support float histogram in store gateway #12792

Job	Run time
Linters (Static Analysis) for Go	1m 11s
Linters (Static Analysis) for Go	1m 11s
Thanos end-to-end tests (8, 0)	4m 34s
Thanos end-to-end tests (8, 0)	4m 34s
Go build for different platforms	7m 43s
Go build for different platforms	7m 43s
Thanos end-to-end tests (8, 1)	3m 34s
Thanos end-to-end tests (8, 1)	3m 34s
Thanos end-to-end tests (8, 2)	3m 21s
Thanos end-to-end tests (8, 2)	3m 3s
Thanos end-to-end tests (8, 3)	3m 57s
Thanos end-to-end tests (8, 3)	3m 57s
Thanos end-to-end tests (8, 4)	7m 6s
Thanos end-to-end tests (8, 4)	7m 6s
Thanos end-to-end tests (8, 5)	3m 38s
Thanos end-to-end tests (8, 5)	3m 38s
Thanos end-to-end tests (8, 6)	3m 47s
Thanos end-to-end tests (8, 6)	3m 47s
Thanos end-to-end tests (8, 7)	3m 46s
Thanos end-to-end tests (8, 7)	3m 46s
	1h 24m 56s

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