✨ Add natgatewayips as source for ingress rules

[alexander-demicev]

What type of PR is this? /kind feature

What this PR does / why we need it: This PR will allow using nat gateway IPs as sources in ingress rules. In my setup, I need machines to be able to connect to the load balancer through a certain port and I would like the load balancer to only accept traffic for this port from my machines. From the load balancer point of view the connection is made from nat gateway IPs so the CAPA API has to have a setting for this.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Special notes for your reviewer:

Checklist:

• [ ] squashed commits
• [ ] includes documentation
• [ ] includes emojis
• [ ] adds unit tests
• [ ] adds or updates e2e tests

Release note:

Add natgatewayips as source for ingress rules

[alexander-demicev]

/test pull-cluster-api-provider-aws-e2e /test pull-cluster-api-provider-aws-e2e-eks

[alexander-demicev]

/test pull-cluster-api-provider-aws-e2e

[alexander-demicev]

/test pull-cluster-api-provider-aws-e2e

[alexander-demicev]

@nrb @damdo folks, can I get a review? all tests are passing

[nrb]

/milestone v2.6.0

[k8s-ci-robot]

@nrb: You must be a member of the kubernetes-sigs/cluster-api-provider-aws-maintainers GitHub team to set the milestone. If you believe you should be able to issue the /milestone command, please contact your Cluster API Provider AWS Maintainers and have them propose you as an additional delegate for this responsibility.

In response to [this](https://github.com/kubernetes-sigs/cluster-api-provider-aws/pull/5005#issuecomment-2159281806): >/milestone v2.6.0 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[nrb]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nrb

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[salasberryfin]

/lgtm thanks for adding this useful feature.