[v2, windows] Add WebviewUserDataPath to windows options

v2/pkg/options/windows/windows.go

@@ -8,4 +8,8 @@ type Options struct {
 
 	// Draw a border around the window, even if the window is frameless
 	EnableFramelessBorder bool
+
+	// Path where the WebView2 stores the user data. If empty %APPDATA%\[BinaryName.exe] will be used.
+	// If the path is not valid, a messagebox will be displayed with the error and the app will exit with error code.
+	WebviewUserDataPath string
 }