Add imperative focus in SpatialNavigationVirtualizedGrid

[arthuruan]

Is your feature request related to a problem? Please describe.
I'm trying to go back the focus to the header of SpatialNavigationVirtualizedGrid, but looks like from the third row I lose the reference of the component and I'm not able to do the imperative focus.

Describe the solution you'd like
I'd like to have I way to keep the header reference while scrolling down. Or even expose the SpatialNavigationVirtualizedList reference in the SpatialNavigationVirtualizedGrid component, would be very helpful. With that, I could scroll to the first grid item and then move the focus to the header. Like that:

 <SpatialNavigationVirtualizedGrid
      ref={virtualizedListRef}
      data={data}
      header={header}
      headerSize={headerSize}
      renderItem={renderItem}
      itemHeight={getItemHeight(itemAspectRatio)}
      numberOfColumns={NUMBER_OF_COLUMNS}
      onEndReachedThresholdRowsNumber={INFINITE_SCROLL_ROW_THRESHOLD}
      onEndReached={onEndReached}
      descendingArrowContainerStyle={styles.topArrowContainer}
      ascendingArrowContainerStyle={styles.bottomArrowContainer}
    />

 useRemoteControlKeys(
    [SupportedKeys.Back],
    useCallback(() => {
      if (isItemFocused) {
        virtualizedListRef.current?.focus(0);
        headerViewRef.current?.focus();
        return true;
      }

      return false;
    }, [isItemFocused]),
  );

Additional context

Screen.Recording.2024-11-06.at.11.28.34.mov