function isResClassIII(h3Index) {
    const [lower, upper] = h3IndexToSplitLong(h3Index);
    return Boolean(H3.isResClassIII(lower, upper));
}
Whether the given H3 index is in a Class III resolution (rotated versus
the icosahedron and subject to shape distortion adding extra points on
icosahedron edges, making them not true hexagons).
@static
@param  {H3IndexInput} h3Index  H3 index to check
@return {boolean}          isResClassIII