Enable custom wrapping of top-lvl React component about wasp HOT 3 CLOSED

I'm quite interested in how we design this one, but I won't get around to it soon so unassigning.

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Suggestion by @infomiho

Do we offer an escape hatch like _app.js in Next.js 12? That would be an ideal place such a thing.

1. If there is a user provided App component then use it as wrapper around router

function App({ children }) {
  return (<ChakraProvider>
{children}
</ChakraProvider>);
}

2. Else provide just a function App(props) { return props.children; } (edited)

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Relevant Discord conversation: https://discord.com/channels/686873244791210014/943092165964349500/1063054735193673728 .

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