core: Gate event system behind a feature flag #182
Description
The event system is useful for a regular router with a GUI/Web UI as it allows displaying router information for the user but for embedded use cases it may not needed at all, meaning emissary-core will waste cycles collecting and accumulating event data, only for the application to discard all that information.
Gate the event system behind events feature flag and only register/accumulate events if the feature flag is enabled, similar to how metrics is implemented for runtimes.