[occm] feature request: support x-forwarded-port and x-forwarded-proto annotations

[huhji-elha]

/kind feature

What happened:
hello, maintainers

occm is currently support X-forwarded-for with service annotation. However, there is no support for X-forwarded-Port and X-forwarded-Proto, which are commonly required by HTTP applications behind L7 load balancers.

How to reproduce it:
And this is my proposed annotations.

ServiceAnnotationLoadBalancerXForwardedPort         = "loadbalancer.openstack.org/x-forwarded-port"
ServiceAnnotationLoadBalancerXForwardedProto        = "loadbalancer.openstack.org/x-forwarded-proto"

According to the Octavia official documentation, both annotations are supported as listener insert_headers options.
See: https://docs.openstack.org/octavia/latest/user/feature-classification/index.html#operation_insert_headers_X_Forwarded_Port

Anything else we need to know?:
If maintainers agree with this approach, I would be happy to open a PR to implement this feature.
Please let me know if that would be acceptable.

Environment:
I'm using occm on kubernetes clusters with f5 driver.

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