Flesh out the visualizer

[cBournhonesque]

• Register the correct metrics when a component/message is registered
• How do we handle metrics per connection on the server? A combination of metrics_tracing_context to add the connection id as a metric label and make sure that bevy_metrics_dashboard handles it?
• List missing metrics

[blueforesticarus]

I'm not super sure why the visualizer needs to be a feature instead of an example? All it does is spawn a standard bevy-metrics-dashboard window right?

[cBournhonesque]

Yes but the relevant metrics need to be exported within lightyear to appear in the bevy-metrics-dashboard. This issue was mostly about expanding the metrics that I register, so that they can be queried/visualized