feat: add nulls to namespace

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---

Author: kgryte

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

@@ -940,6 +940,15 @@ setReadOnly( ns, 'nullaryStrided1dDispatchFactory', require( '@stdlib/ndarray/ba
 */
 setReadOnly( ns, 'nullaryBlockSize', require( '@stdlib/ndarray/base/nullary-tiling-block-size' ) );
 
+/**
+* @name nulls
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/base/nulls}
+*/
+setReadOnly( ns, 'nulls', require( '@stdlib/ndarray/base/nulls' ) );
+
 /**
 * @name numel
 * @memberof ns