fix(searchbox): ignore composition events with option

[dhayab]

Summary

We adjusted how SearchBox handles input events in #5963 to prevent sending unnecessary search requests during a composition session, mostly occuring with people using input method editors to enter their search query.

After release, we received #5986 which was directly linked to the previous adjustment. During our tests, multiple Android target devices initiate composition sessions when typing, if a "predictive text" feature is enabled on a virtual keyboard with a latin character set. This breaks the "search as you type" experience for no reason, as latin characters can be used as-is to refine search queries. This behaviour is not consistent with desktop usage and mobile usage on iOS.

After careful consideration, it seems there is no reliable way to correctly filter-out events within composition sessions in relevant character sets. Instead, this PR sets this behaviour behind a option on the Searchbox widget.

For example, in InstantSearch.js:

searchBox({
  container: '#searchbox',
  ignoreCompositionEvents: true,
})

Result

• by default, all input events are handled by the SearchBox widget
• with ignoreCompositionEvents: true, input events within a composition session are ignored and won't trigger search requests

FX-2721
Fixes #5986

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Sandbox	Source
InstantSearch.js	Configuration
react-instantsearch-app	Configuration
example-react-instantsearch-default-theme	Configuration
example-react-instantsearch-next-app-dir-example	Configuration
example-vue-instantsearch-default-theme	Configuration