Add support for overriding default hostname type

[stevehipwell]

Description

What problem are you trying to solve?
I'd like to be able to override the subnet default hostname type for EC2 instances created by Karpenter.

How important is this feature to you?
This is a nice to have based on consistency with nodes created from an autoscaling group & launch template pattern.

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[jonathan-innis]

I'd like to be able to override the subnet default hostname type for EC2 instances created by Karpenter

@stevehipwell Is this a launch template configuration setting?

[stevehipwell]

@jonathan-innis I think it is. However the general docs which says that you can use the resource name for hostname in all scenarios is contradicted in other documents. I think this is still useful if you need an IPv6 enabled subnet, but less compelling.