chore(all): move sub-packages to internal/provider

internal/provider/cyberghost/updater/countries.go

@@ -0,0 +1,15 @@
+package cyberghost
+
+func mergeCountryCodes(base, extend map[string]string) (merged map[string]string) {
+	merged = make(map[string]string, len(base))
+	for countryCode, region := range base {
+		merged[countryCode] = region
+	}
+	for countryCode := range base {
+		delete(extend, countryCode)
+	}
+	for countryCode, region := range extend {
+		merged[countryCode] = region
+	}
+	return merged
+}