Import the js-sdk at the index so the `request` object gets set

Now that all the imports are replaced, we need to set up the js-sdk somewhere. Might as well do it in the index of the react-sdk where callers will be relying on those skin functions.

src/index.js

@@ -28,3 +28,7 @@ export function resetSkin() {
 export function getComponent(componentName) {
     return Skinner.getComponent(componentName);
 }
+
+// Import the js-sdk so the proper `request` object can be set. This does some
+// magic with the browser injection to make all subsequent imports work fine.
+import "matrix-js-sdk";