fix(elasticloadbalancingv2): dualstack ALB missing default IPv6 ingress rule

[BryanPan342]

[ISSUE]
ALB configured with ipAddressType: dualstack and internetFacing: true missing ingress rule for IPv6.

[APPROACH]
Add a property in IApplicationLoadBalancer to obtain ipAddressType in listener constructor.
Add a check in ApplicationListener constructor to check for ipAddressType of dualstack

[NOTE]
Implemented dualstack check only in the constructor because any additional ingress rule should be specified by the user upon further use.

Fixes #7043

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[BryanPan342]

[ACTIONABLES]

• Update documentation for IApplicationLoadBalancer

Marked this as done because the interface isn't currently specified in the elbv2 README and adding it doesn't seem to provide substantial benefit for customers (don't want to add to size of README)

• Add integration tests for 'dualstack' ALB

[BryanPan342]

I found creating a IPv6 subnet to be a pain point and it seems some customers agree (#894). Since there is a workaround, I don't think it needs immediate attention but wanted to just point it out to ensure that it doesn't get forgotten. I would also be willing to work on it if I have free time!

Pull request has been modified.

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildProject6AEA49D1-qxepHUsryhcu
• Commit ID: c1d6de8
• Result: SUCCEEDED
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Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).