enable networkCost for KubeCost

[csantanapr]

When installing kubecost with the following command

eksdemo install kubecost-eks-amp -c "$CLUSTER_NAME" --node-exporter --ingress-host "kubecost.$ROUTE53_HOSTED_ZONE" --ingress-class=nginx --nginx-pass "$PASSWORD" --dry-run

It doesn't enable networkCost by default.
I think it would be useful to enable networkCost configured with AWS settings as described in the docs
https://docs.kubecost.com/install-and-configure/advanced-configuration/network-costs-configuration#enabling-network-costs

What it takes is to pass some extra values to the helm install, this will configure and install the deamonset/agent

Network cost, which is disabled by default, needs to be run as a privileged pod to access the relevant networking kernel module on the host machine.

Not sure if the privileged pod in would work on fargate or boottlerocket out of the box