Replace implementation of NetworkTrafficShaping with Bandwidth Plugin support

[zanetworker]

Currently, the network traffic shaping controller relies on exec`ing either into the pod or to an ephemeral container attached to the pod, this would work if modifying the security context of an ephemeral container was possible (see kubernetes/kubernetes#53188).

Until this feature is enabled, we can modify the implementation of the network traffic shaper to use the CNI bandwidth plugin. The spec of the NetworkTrafficShaper would have settings for ingress and egress limits on the target pods/services/endpoints.