feat(hierarchical-menu): persist refined root level count with a future flag #5950
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Summary
The current design of hierarchical facets in InstantSearch is to show the count of the active refined parent level next to its root level. This is not necessarily what current users of InstantSearch expect, so this PR provides an option in the form a future flag, to allow them to switch to a new behaviour where the root level count is not modified in answer to refinement changes.
Result
Users can now choose whether they want a hierarchical facet parent count reflected in the root level, or leave the root count untouched.
FX-2671