fix(hits): rename the exposed "hits" to "items"

[Haroenv]

Summary

Replace the exposed hits with items for consistency with recommend, transformItems and other widgets that all return items.

hits of course still works for now, but items is also available from the connectors.

Result

As well as hits, items is also available from connectHits, connectInfiniteHits (connectGeoSearch already only had items)

There's no warning for using hits, as there's no way to have that in a way which doesn't warn for regular usage too.

For now, no change is done in ui-components, but I'm happy to do so if we're happy with the hypothetical breaking change for that package.

[codesandbox-ci[bot]]

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Sandbox	Source
example-instantsearch-getting-started	Configuration
example-react-instantsearch-getting-started	Configuration
example-react-instantsearch-next-app-dir-example	Configuration
example-react-instantsearch-next-routing-example	Configuration
example-vue-instantsearch-getting-started	Configuration

[Haroenv]

not that I saw @dhayab