Allow user to specify LoadBalancerIP for Service in helm chart

[kate-osborn]

What would you like to be added:
The ability to specify the LoadBalancerIP for the nginx-gateway Service through helm:

helm install ... --set service.loadBalancerIP="10.0.0.0"

[sjberman]

Could this be related to #1865?

[kate-osborn]

Could this be related to #1865?

Yep. Looks like NIC supports both these fields: https://github.com/nginxinc/kubernetes-ingress/blob/main/charts/nginx-ingress/values.yaml