Update tracing directives on runtime

[ljoss17]

Summary

Currently in order to change the log level of Hermes, the instance needs to be restarted. tracing has a reload_handle allowing directive updates for the logs. https://docs.rs/tracing-subscriber/0.3.17/tracing_subscriber/fmt/struct.SubscriberBuilder.html#method.with_filter_reloading

Proposal

Set up an endpoint which listens to tracing directives, https://docs.rs/tracing-subscriber/0.3.17/tracing_subscriber/filter/struct.EnvFilter.html#directives, and update the logs displayed.

Add some CLIs to facilitate updating the tracing directives.

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