Given an {outpoint}, sets the description on the matching outpoint (if exists).
Note that if no outpoint exists in bookkeeper, will return an empty list
Changleog-Added: PLUGINS: bookkeeper has a new RPC `bkrp-editdescriptionbyoutpoint` which will set/update a description for an outpoint creation event.
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).