feat: add nans to namespace

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---

Author: kgryte

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

@@ -805,6 +805,15 @@ setReadOnly( ns, 'minViewBufferIndex', require( '@stdlib/ndarray/base/min-view-b
 */
 setReadOnly( ns, 'minmaxViewBufferIndex', require( '@stdlib/ndarray/base/minmax-view-buffer-index' ) );
 
+/**
+* @name nans
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/base/nans}
+*/
+setReadOnly( ns, 'nans', require( '@stdlib/ndarray/base/nans' ) );
+
 /**
 * @name ndarraylike2ndarray
 * @memberof ns