function getRes0Cells() {
    const count = H3.res0CellCount();
    const hexagons = C._malloc(SZ_H3INDEX * count);
    try {
        throwIfError(H3.getRes0Cells(hexagons));
        return readArrayOfH3Indexes(hexagons, count);
    } finally {
        C._free(hexagons);
    }
}
Get all H3 indexes at resolution 0. As every index at every resolution > 0 is
the descendant of a res 0 index, this can be used with h3ToChildren to iterate
over H3 indexes at any resolution.
@static
@return {H3Index[]}  All H3 indexes at res 0