Expose metadata_options {instance_metadata_tags}

## Describe the Feature

This is a follow up on https://github.com/cloudposse/terraform-aws-ec2-autoscale-group/issues/87

For some time AWS allows to enable instance tags in metadata through:

```hcl
metadata_options {
instance_metadata_tags = "enabled"
}
```

See: https://aws.amazon.com/about-aws/whats-new/2022/01/instance-tags-amazon-ec2-instance-metadata-service/

## Expected Behavior

Ability to enable instance_metadata_tags

## Use Case

Please see original issue in `terraform-aws-ec2-autoscale-group/`