Wavefront-Proxy statefullness

[vavdoshka]

I know one of the features of Wavefront-Proxy is to serve as a persistent buffer between metrics collectors and Wavefront Cloud. We saw this in action multiple times and it helped us to backfill the metrics on events of some network issues and misconfigurations (like token revocation). Could it be possible to make this chart to support StatefullSet type of WF-Proxy deployment? With the ability to extendvolumeMounts to provide some persistent volumes.

[helen-shao]

This is being tracked in an issue for the wavefront collector of Kubernetes: K8SSAAS-1077