[react] add forwardRef and createRef functions for React v16.3 (#24624)

* feat(react): add forwardRef and createRef functions

* fix(tests): fix failing tests
- datepicker needs to be updated to use optional generic types since it was using ClassAttributes incorrectly

types/create-react-class/create-react-class-tests.ts

@@ -11,7 +11,7 @@ interface State {
     bar: number;
 }
 
-const props: Props & React.ClassAttributes<{}> = {
+const props: Props = {
     foo: "foo"
 };