feat(hits): add banner to react instantsearch hits

[taylorcjohnson]

Summary

This is the fourth pull request to add support for no-code banners to the Hits widget (RFC). Building on the recent changes to the Hits instantsearch-ui-component it updates the Hits React InstantSearch widget to support a new bannerComponent.

EMERCH-1421

There will be a follow-on PR to update React InstantSearch.

Result

The hits widget tests have been updated to ensure that the new optional banner component is supported. No styling was applied in the examples or to instantsearch.css - that will most likely come in a follow-up PR.

Additionally, the code was tested in the getting-started example codebase (connected to appId: F4T6CUV2AH, index: products in the beta environment - where the test rules with a banner consequence exists).

Getting Started App (no bannerComponent; query: nikon; nikon camera promotion alt text and links to https://www.nikonusa.com/):

Getting Started App (custom bannerComponent; query nikon):

Getting Started App (bannerComponent={false}; query nikon):

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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