Rare‐Earth‐Metal‐Free Solid‐State Fluorescent Carbonized‐Polymer Microspheres for Unclonable Anti‐Counterfeit Whispering‐Gallery Emissions from Red to Near‐Infrared Wavelengths (Rare-Earth-Metal-Free Solid-State Fluorescent Carbonized-Polymer Microspheres for Unclonable Anti-Counterfeit Whispering-Gallery Emissions from Red to Near-Infrared Wavelengths)