fix: ignore composition events with option

[dhayab]

This PR reintegrates #1226 and sets the behaviour behind an option, as in algolia/instantsearch#6009.

---

Summary

Characters entered using an IME trigger search requests although the character composition is not done. This should only happen if the character has been fully composed.

This PR stops processing input events when composing with an IME and instead rely on the compositionend event in that case. This is controled by a new ignoreCompositionEvents option.

autocomplete({
  // ...
  ignoreCompositionEvents: true,
})

It also prevents keyboard inputs being processed by Autocomplete if the user is currently navigating through suggestions in an IME.

Result

Before

After

Fixes algolia/docsearch#1304
Fixes algolia/docsearch#1043
Fixes #1135

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