Function logfile_layers

fn logfile_layers<S>(
    config: &LoggingConfig,
    mistrust: &Mistrust,
    path_resolver: &CfgPathResolver,
) -> Result<(impl Layer<S>, Vec<WorkerGuard>)>
where
    S: Subscriber + for<'span> LookupSpan<'span> + Send + Sync,

Try to construct a tracing [Layer] for all of the configured logfiles.

On success, return that layer along with a list of [WorkerGuard]s that need to be dropped when the program exits.