feat(index): accept "composed" widgets in add/removeWidgets #6700
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Summary
Accept composed widgets - a composed widget is a widget that itself is an array of widgets - as an argument to addWidgets and removeWidgets.
This will be useful for InstantSearch.js autocomplete widget that will have multiple widgets composing the single widget.
This enables the "pseudo-widget" signature of
function myWidget(params): Widget[]instead of justfunction myWidget(params): WidgetResult
addWidgets and removeWidgets accept a widget that itself is a list, by flattening the list before using it.
FX-3501