[FEATURE] Enable option for aws batch best-fit-progressive allocation strategy

[kevinsoucy]

Is your feature request related to a problem? Please describe.

Enable an optional parameter on the AWS batch module for On Demand compute environments to use BEST FIT PROGRESSIVE, without it, it can take a long time for instances to spin up.

allocation_strategy=batch.AllocationStrategy("BEST_FIT_PROGRESSIVE"),

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[srinivasreddych]

Thanks for reaching out. I will be looking into it

[srinivasreddych]

Gave an initial attempt to add the AllocationStrategies. I was able to deploy them fine but the pytests are failing bc it is not recognizing these strategies. I guess i need to move to GA batch cdk module from alpha to fix the pytests issue.