chore(publicip): less coupling with ipinfo.io

internal/publicip/api/interfaces.go

@@ -0,0 +1,13 @@
+package api
+
+import (
+	"context"
+	"net/netip"
+
+	"github.com/qdm12/gluetun/internal/models"
+)
+
+type Fetcher interface {
+	FetchInfo(ctx context.Context, ip netip.Addr) (
+		result models.PublicIP, err error)
+}