Support for instance_requrirements in launch_template to create EC2 instances

[kitos9112]

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Describe the Feature (Use Case)

I would like to fire EC2 instances based on instance requirements rather than having to specify a given instance type. For example, I want a bare minimum of 4 vCPU with 16 GiBs of RAM across my EC2 instance fleet.

Expected Behavior

I don't mind if we implemented it in a non-backwards compatible way. Although, I believe it's doable. THe instance_requirements variable would clash if configured alongside the instance_type

Describe Ideal Solution

The TF provider has support for all of these elements:

https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/launch_template#instance-requirements

In fact, the OSS Terraform-modules equivalent leverages a similar approach

https://github.com/terraform-aws-modules/terraform-aws-autoscaling/blob/master/main.tf#L160

Alternatives Considered

Stop using this module to create ASGs and rely on other partners or a self-baked one.

Additional Context

N/A