feat: run histogram quantile in safe mode for incomplete data (GreptimeTeam#7297)

* initial impl

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* sqlness test and fix

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* correct sqlness case

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* simplification

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

* refine code and comment

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

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Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

Author: waynexia