[elbv2-controller] Support for EnablePrefixForIpv6SourceNat

[argo1984]

Is your feature request related to a problem?
We need the Option EnablePrefixForIpv6SourceNat for the NLB to use it for DualStack UDP Traffic. The Option is needed if you want to use the NLB for UDP IPv6 and IPv4 Traffic. Without the Prefix for SourceNat it is not possible to handle both.

Describe the solution you'd like
We need the Option in the elbv2-controller. The documentation about is:
https://docs.aws.amazon.com/elasticloadbalancing/latest/APIReference/API_LoadBalancer.html

EnablePrefixForIpv6SourceNat
[Network Load Balancers with UDP listeners] Indicates whether to use an IPv6 prefix from each subnet for source NAT. The IP address type must be dualstack. The default value is off.

Type: String

Valid Values: on | off

Required: No

Describe alternatives you've considered
There is also an open issue for the terraform provider:
hashicorp/terraform-provider-aws#40379

The only solution for us is to create the NLB manually currently

[github-actions]

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