feat: add mskmax and mskmin to namespace

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---

Author: kgryte

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

@@ -486,6 +486,24 @@ setReadOnly( ns, 'minabs', require( '@stdlib/stats/base/ndarray/minabs' ) );
 */
 setReadOnly( ns, 'minsorted', require( '@stdlib/stats/base/ndarray/minsorted' ) );
 
+/**
+* @name mskmax
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/mskmax}
+*/
+setReadOnly( ns, 'mskmax', require( '@stdlib/stats/base/ndarray/mskmax' ) );
+
+/**
+* @name mskmin
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/mskmin}
+*/
+setReadOnly( ns, 'mskmin', require( '@stdlib/stats/base/ndarray/mskmin' ) );
+
 /**
 * @name nanmax
 * @memberof ns