In Vitro Study of Ethyl‐4‐(3,4.5‐trimethoxyphenyl)‐2,7,7‐trimethyl‐5‐oxo1,4,5,6,7,8‐hexahydroquinoline‐3‐carboxylate and Bovine Serum Albumin Using Multi‐Spectroscopic Techniques and Molecular Docking