Allocation strategies for Spot Instances

[lzyli]

Description

What problem are you trying to solve?
Spot fleet supports multiple strategies to optimize cost or availability. I would like to set a strategy to provide a spot instance.
How important is this feature to you?
Highly important, It helps us increase HA and cost optimization also.

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[jmdeal]

Going to close as a duplicate of #1240. If you have any additional details on why you want to select a strategy other than PriceCapacityOptimized, please add them there.