feat: add gindexOfColumn to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/lib/index.js

@@ -774,6 +774,15 @@ setReadOnly( ns, 'gfindLastIndex', require( '@stdlib/blas/ext/base/gfind-last-in
 */
 setReadOnly( ns, 'gindexOf', require( '@stdlib/blas/ext/base/gindex-of' ) );
 
+/**
+* @name gindexOfColumn
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/blas/ext/base/gindex-of-column}
+*/
+setReadOnly( ns, 'gindexOfColumn', require( '@stdlib/blas/ext/base/gindex-of-column' ) );
+
 /**
 * @name gindexOfRow
 * @memberof ns