feat: add maxBy to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/lib/index.js

@@ -72,6 +72,15 @@ setReadOnly( ns, 'dmax', require( '@stdlib/stats/base/ndarray/dmax' ) );
 */
 setReadOnly( ns, 'max', require( '@stdlib/stats/base/ndarray/max' ) );
 
+/**
+* @name maxBy
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/max-by}
+*/
+setReadOnly( ns, 'maxBy', require( '@stdlib/stats/base/ndarray/max-by' ) );
+
 /**
 * @name scumax
 * @memberof ns