Expose API to get supported widget list

pkg/gui/widget.go

@@ -0,0 +1,9 @@
+package gui
+
+import "github.com/fyne-io/defyne/internal/guidefs"
+
+// WidgetClassList returns the list of supported widget & container classes.
+// These can be used for passing to `CreateNew` or `EditorFor`.
+func WidgetClassList() []string {
+	return guidefs.WidgetNames
+}