Optional telemetry handler that logs Mnemosyne events via Logger.
Attach in your application supervision tree:
Mnemosyne.Telemetry.DefaultHandler.attach()
All log entries use domain: [:mnemosyne] metadata for filtering.
domain: [:mnemosyne]
Attaches Logger handlers to all Mnemosyne telemetry events.
Detaches all handlers.
@spec attach() :: :ok
@spec detach() :: :ok