refactor: update import paths to use internal package

pkg/converter/constant/format.go

@@ -0,0 +1,42 @@
+package constant
+
+import "github.com/thediveo/enumflag/v2"
+
+type ConversionFormat enumflag.Flag
+
+const (
+	WebP ConversionFormat = iota
+)
+
+var CommandValue = map[ConversionFormat][]string{
+	WebP: {"webp"},
+}
+
+var HelpText = enumflag.Help[ConversionFormat]{
+	WebP: "WebP Image Format",
+}
+
+var DefaultConversion = WebP
+
+func (c ConversionFormat) String() string {
+	return CommandValue[c][0]
+}
+
+func ListAll() []string {
+	var formats []string
+	for _, names := range CommandValue {
+		formats = append(formats, names[0])
+	}
+	return formats
+}
+
+func FindConversionFormat(format string) ConversionFormat {
+	for convFormat, names := range CommandValue {
+		for _, name := range names {
+			if name == format {
+				return convFormat
+			}
+		}
+	}
+	return DefaultConversion
+}