Pengaruh struktur kepemilikan, penyaluran kredit dan risiko kredit terhadap kinerja bank umum konvensional di Bursa Efek Indonesia periode 2015-2020: studi empiris pandemi covid-19 = The effect of ownership structure, credit distribution and credit risk on conventional commercial banks’ performance in Indonesia stock exchange from 2015-2020: an empirical study of the covid-19 pandemic