[eks] [request]: Support for the newly-introduced price-capacity-optimized spot strategy for eks managed nodes

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**Tell us about your request**
Currently EKS managed node groups default to `capacity-optimized` strategy for spot instances. Instead, useful if EKS supports customizing so we can make use of the newly launched (and [recommended by AWS](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-fleet-allocation-strategy.html) ?) [`price-capacity-optimized`](https://aws.amazon.com/blogs/compute/introducing-price-capacity-optimized-allocation-strategy-for-ec2-spot-instances/) strategy instead.

**Which service(s) is this request for?**
EKS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
Trying to customize the spot allocation strategies on EKS managed node groups based on requirements.

**Are you currently working around this issue?**
None. When absolutely needed, using self-managed node groups so that we have full control over the underlying ASG and spot allocation strategies.

**Additional context**
- https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-fleet-allocation-strategy.html
- https://aws.amazon.com/blogs/compute/introducing-price-capacity-optimized-allocation-strategy-for-ec2-spot-instances/
- https://docs.aws.amazon.com/eks/latest/userguide/managed-node-groups.html

No repository files, tests, or entry points are identified in the issue. Start by reviewing the EKS managed node group documentation and the linked AWS spot allocation strategy references, then locate how the current capacity-optimized strategy is represented. Done means EKS managed node groups can configure the price-capacity-optimized strategy instead.

Written by the indexing model from the issue text.