feat(getServerState): allow users to inject renderToString

[Haroenv]

Summary

There are some cases where the combination of trying to make sure renderToString doesn't end up in a browser bundle, being runnable on esm + cjs, react 17 and 18, .js extension etc. blows up.

One of those is pnpm/vercel removing "unused" packages.

Result

This PR introduces a new argument renderToString to getServerState so you can inject the dependency yourself, meaning the import is within your own code and won't be purged.

import { renderToString } from 'react-dom/server';
await getServerState(<App/>, renderToString);
await getServerState(<App/>, import('react-dom/server').then(mod => mod.renderToString));

fixes #3633 closes #3618 see vercel/next.js#40067 FX-1869

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Sandbox	Source
react-instantsearch-app	Configuration
hooks-example	Configuration
hooks-next-example	Issue #3633

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[francoischalifour]

Don't we want to be more cautious and have it in a param object?

await getServerState(<App/>, { renderToString });