feat: add ndarray2string to namespace

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---

Author: kgryte

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

@@ -918,6 +918,15 @@ setReadOnly( ns, 'toReversed', require( '@stdlib/ndarray/to-reversed' ) );
 */
 setReadOnly( ns, 'toReversedDimension', require( '@stdlib/ndarray/to-reversed-dimension' ) );
 
+/**
+* @name ndarray2string
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/to-string}
+*/
+setReadOnly( ns, 'ndarray2string', require( '@stdlib/ndarray/to-string' ) );
+
 /**
 * @name unshift
 * @memberof ns