feat: add ndarray to namespace

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---

Author: kgryte

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

@@ -630,6 +630,15 @@ setReadOnly( ns, 'nanvariancewd', require( '@stdlib/stats/base/nanvariancewd' )
 */
 setReadOnly( ns, 'nanvarianceyc', require( '@stdlib/stats/base/nanvarianceyc' ) );
 
+/**
+* @name ndarray
+* @memberof ns
+* @readonly
+* @type {Namespace}
+* @see {@link module:@stdlib/stats/base/ndarray}
+*/
+setReadOnly( ns, 'ndarray', require( '@stdlib/stats/base/ndarray' ) );
+
 /**
 * @name range
 * @memberof ns