enhancementgood first issue
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Description
Expose Telemetry events for important lifecycle actions by calling https://hexdocs.pm/telemetry/telemetry.html#span/3
[:beacon, :core, :load_resource, :start | :stop]
Emit start/stop events for each resource loaded by Beacon.Loader, adding the loaded resource in the event metadata. For eg loading a page would emit the following events:
[:beacon, :core, :load_resource, :start]
metadata: %{page: %Page{...}}
[:beacon, :core, :load_resource, :stop]
metadata: %{page: %Page{...}}
And it would be called here https://github.com/BeaconCMS/beacon/blob/cbe3bf7445cc559c96310593105e710366ed2cea/lib/beacon/loader.ex#L236
Here is the list of resources that must emit telemetry events https://github.com/BeaconCMS/beacon/blob/cbe3bf7445cc559c96310593105e710366ed2cea/lib/beacon/loader.ex#L127
[:beacon, :core, :render_page, :start | :stop]
The entire block of PageLive.render/1 must be tracked and emit a telemetry event so we can measure rendering times.