added file upload tool and fileUploadProvider

src/canvas/widgets/base.js

@@ -344,7 +344,7 @@ class Widget extends React.Component {
     }
 
     generateCode(){
-        throw new NotImplementedError("Get Code must be implemented by the subclass")
+        throw new NotImplementedError("generateCode() must be implemented by the subclass")
     }
 
     getAttributes() {

src/canvas/widgets/draggableWidgetContext.js

@@ -4,7 +4,7 @@ const DragWidgetContext = createContext()
 
 export const useDragWidgetContext = () => useContext(DragWidgetContext)
 
-// Provider component to wrap around parts of your app that need drag-and-drop functionality
+// Provider component to wrap around parts that need drag-and-drop functionality
 export const DragWidgetProvider = ({ children }) => {
     const [draggedElement, setDraggedElement] = useState(null)