Function plan_auto_scaling_strategy 

fn plan_auto_scaling_strategy(
    value: ClusterAutoScalingStrategyOptionValue,
) -> Result<Option<AutoScalingStrategy>, PlanError>

Convert a ClusterAutoScalingStrategyOptionValue into an AutoScalingStrategy. An empty block (no sub-policies) maps to None (autoscaling disabled), so an empty AUTO SCALING STRATEGY = () behaves like a reset. Cross-config invariants are checked separately by validate_auto_scaling_strategy.

The reverse of unplan_auto_scaling_strategy.