feat: add gcusum to namespace

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---

Author: kgryte

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

@@ -54,6 +54,15 @@ setReadOnly( ns, 'dcusum', require( '@stdlib/blas/ext/base/ndarray/dcusum' ) );
 */
 setReadOnly( ns, 'dsum', require( '@stdlib/blas/ext/base/ndarray/dsum' ) );
 
+/**
+* @name gcusum
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/blas/ext/base/ndarray/gcusum}
+*/
+setReadOnly( ns, 'gcusum', require( '@stdlib/blas/ext/base/ndarray/gcusum' ) );
+
 /**
 * @name gsum
 * @memberof ns