Maint: split Go files in dns package

internal/dns/settings.go

@@ -0,0 +1,19 @@
+package dns
+
+import (
+	"context"
+
+	"github.com/qdm12/gluetun/internal/configuration"
+)
+
+func (l *looper) GetSettings() (settings configuration.DNS) { return l.state.GetSettings() }
+
+type SettingsSetter interface {
+	SetSettings(ctx context.Context, settings configuration.DNS) (
+		outcome string)
+}
+
+func (l *looper) SetSettings(ctx context.Context, settings configuration.DNS) (
+	outcome string) {
+	return l.state.SetSettings(ctx, settings)
+}