This makes use of the new discovery algorithm introduced in
`swh-loader-core`, which should help speed up large (think Linux
kernel or way larger) scans.
Most of the time is spend walking the on-disk directory and hashing,
which is where the new optimizations in `swh-model==6.5.0` should come
in handy. Python is close to its limit in that regard, some future
endeavor should look into setting up SWH for native extensions.