Proposal: Standard Istio Configuration Model

The long promised standard configuration model doc:

https://docs.google.com/document/d/1T22PxxLwwFnxC_yFQ_HmuKsuZgFjRcDy2BRb5enfYpk/

There are many details that are missing, I’d like to go over this in Friday’s TOC meeting to get some consensus on the approach.