feat: Add support for specifying elastic inference accelerator

[rucha3]

PR o'clock

Description

This PR implements feature requested in #1175

It allows adding an elastic inference accelerator type to worker groups.
Example usage:

worker_groups_launch_template = [
   ...
    {
      name                          = "worker-group"
      instance_type                 = "c5.large"
      asg_desired_capacity          = 1
      public_ip                     = true
      elastic_inference_accelerator = "eia2.medium"
    },
   ...
  ]

Resolves #1175

Checklist

• CI tests are passing
• README.md has been updated after any changes to variables and outputs. See https://github.com/terraform-aws-modules/terraform-aws-eks/#doc-generation

[rucha3]

Hi @barryib . Would it be possible to get a review on this PR?

[github-actions]

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