feat: add nanmaxBy to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/stats/array/lib/index.js

@@ -162,6 +162,15 @@ setReadOnly( ns, 'mskrange', require( '@stdlib/stats/array/mskrange' ) );
 */
 setReadOnly( ns, 'nanmax', require( '@stdlib/stats/array/nanmax' ) );
 
+/**
+* @name nanmaxBy
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/array/nanmax-by}
+*/
+setReadOnly( ns, 'nanmaxBy', require( '@stdlib/stats/array/nanmax-by' ) );
+
 /**
 * @name nanmin
 * @memberof ns