chore(publicip): refactoring

- Exported `Fetcher` interface
- Inject `Fetcher` to publicip loop and updaters
- Get public IP and information at the same time
- Only query ipinfo.io
- Make `MultiInfo` part of the `Fetch` object

internal/provider/privado/updater/servers.go

@@ -68,7 +68,7 @@ func (u *Updater) FetchServers(ctx context.Context, minServers int) (
 
 	servers = hts.toServersSlice()
 
-	if err := setLocationInfo(ctx, u.client, servers); err != nil {
+	if err := setLocationInfo(ctx, u.ipFetcher, servers); err != nil {
 		return nil, err
 	}