fix(client): use client.search in sffv for v5

[Haroenv]

Summary

v5 has a searchForFacetValues function, but it's single-index only. We thus need to detect it and use client.search directly. In a future major we can change this and only use client.search

Result

• v5 allows sffv in the type for the full client (repro: https://github.com/WavyWalk/reproduce-algolia-v5/blob/typing-5-3-0/src/App.tsx#L11)
• sffv isn't called in v5, but client.search instead

fixes algolia/algoliasearch-client-javascript#1550

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example-react-instantsearch-next-routing-example	Configuration
example-vue-instantsearch-getting-started	Configuration

[dhayab]

Thanks for the fix :)