Draft: allow user to rename devices

prototype of a renaming system.

based on wireplumber's rule system https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration/modifying_configuration.html#working-with-rules

makes use of the fact that SPA-JSON is a superset of JSON so we can just read and write JSON and not bother with SPA directly

currently requires manually running systemctl --user restart wireplumber.service after changes

config file in ~/.config/wireplumber/wireplumber.conf.d/00-plasma-pa.conf

change tracking not implemented

reset capabilities not implemented