This switches the logging implementation from using the `log`-facade
to using the `tracing-subscriber` instead. This allows us to also tap
into the tracing instrumentation if desired, which was not possible
with `log`.
Changelog-Changed cln-plugin: The logging adapter now uses tracing-subscriber allowing the `tracing` ecosystem to be used. No format changes.
Any file in this directory which is executable and whose name only
consists of alphanumeric characters, space, '.', '-' or '_' will be
automatically loaded when lightningd starts (unless suppressed with
commandline options).
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