Proxy Status dashboard (product feature)

### What should we add or change to make your life better?
Dashboard for proxy status and monitoring configuration
### Why is this important to you?
Web front end so that people can understand and monitor the state of the proxy without having to go manually parse logs etc.

Should depend on #124 ( REST / gRPC endpoint). Ideally this could be built and run independently from the proxy process.
In larger sites, there can be multiple instances of the proxy server, so the dashboard would ideally be able to pull data from each individual proxy without having to have multiple instances of the dashboard.
It could be delivered as an independent project, that just depends on a well known API endpoint.

(Came as part of scenario discussion with @Kahbazi )