Add log information about the runtime of getroutes.
Changelog-None: askrene: add runtime of getroutes to the logs
Signed-off-by: Lagrang3 <lagrang3@protonmail.com>
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).