Rollup set to commonjs results in the whole package being in our bundle.

`supertokens-auth-react` is currently a huge part of our web bundle.

This seems to be due to it's rollup config being set to "commonjs", while it should be "es" with preserveModules to `true` (since it's a react module, not a node-js module)
That would allow users to only import the SuperTokensWrapper for example and it being tree shaked properly