Support instance weights for override_instance_types

It would be great when using an ASG with multiple instance types, to be able to specify weights, something like:

override_instance_types = [
        {
          instance_type     = "t3a.xlarge"
          weighted_capacity = 4
        },
        {
          instance_type     = "t3.xlarge"
          weighted_capacity = 4
        },
        {
          instance_type     = "t3a.large"
          weighted_capacity = 2
        },
        {
          instance_type     = "t3.large"
          weighted_capacity = 2
        },
      ]

But this seems impossible due to https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/workers_launch_template.tf#L168

https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/docs/spot-instances.md#using-launch-templates-with-both-spot-and-on-demand mentions "(first in the array if they are not weighted)." but I do not see how to weight them.

Cheers!

[antonbabenko]

This issue has been resolved in version 18.0.0 🎉

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