Add support for Provisioned Control Plane

[askulkarni2]

Is your request related to a new offering from AWS?

Is this functionality available in the AWS provider for Terraform? See CHANGELOG.md, too.

• Yes ✅: please list the AWS provider version which introduced this functionality

https://github.com/hashicorp/terraform-provider-aws/releases/tag/v6.23.0

Is your request related to a problem? Please describe.

N/A

Describe the solution you'd like.

As a cluster administrator I would like to create/update EKS cluster at a tier supported by Provisioned Control Plane.

E.g.

# EKS Provisioned Control Plane configuration
  control_plane_scaling_config = {
    tier = "tier-xl"
  }

Describe alternatives you've considered.

N/A

Additional context

I can contribute this feature.

[antonbabenko]

This issue has been resolved in version 21.10.0 🎉