pg-node uninstall-geofiles

Please add `pg-node uninstall-geofiles` command.
Because it's hard to delete geofiles manually

```console
rm -f /var/lib/pg-node/assets/geoip.dat
rm -f /var/lib/pg-node/assets/geosite.dat
rm -f /var/lib/pg-node/xray-core/geoip.dat
rm -f /var/lib/pg-node/xray-core/geosite.dat

docker restart node
```