feat: make ingress extensible

[eminugurkenar]

in order to extend Ingress object for custom needs implemented couple of changes

• for some ingress classes sorting paths is not something you would want , for instance ALB ingress controller , because order matters while evaluating the rules, so i think we can provide a prop to get sorting function from outside of lib.

• IngressBackend constructor should be public in order to extend it , sometimes you need to add extra functionally, like for ALB ingress controller , 'use-annotation'

https://kubernetes-sigs.github.io/aws-load-balancer-controller/v2.2/guide/ingress/annotations/

alb.ingress.kubernetes.io/actions.${action-name} Provides a method for configuring custom actions on a listener, such as Redirect Actions.

The action-name in the annotation must match the serviceName in the Ingress rules, and servicePort must be use-annotation.`