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/publicip/interfaces.go

@@ -23,6 +23,7 @@ type stateManager interface {
 	SetSettings(ctx context.Context, settings settings.PublicIP) (outcome string)
 }
 
-type fetcher interface {
-	FetchPublicIP(ctx context.Context) (ip net.IP, err error)
+type Fetcher interface {
+	FetchInfo(ctx context.Context, ip net.IP) (
+		result publicipmodels.IPInfoData, err error)
 }