Update `<ApiProvider>` to throw an error if it's used inside of another `<Provider>`

[markerikson]

<ApiProvider> is only meant for apps that don't already have a Redux store being created. But, we've repeatedly seen people try to use something like <Provider store={store}><ApiProvider>, and then wonder why the app breaks.

We should add a debug check inside of <ApiProvider> that checks for the existence of const store = useStore() (or similar), and throw an error if it finds that above, to try to help users avoid that error.