feat: add flattenShape to namespace

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---

Author: kgryte

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

@@ -445,6 +445,15 @@ setReadOnly( ns, 'flag', require( '@stdlib/ndarray/base/flag' ) );
 */
 setReadOnly( ns, 'flags', require( '@stdlib/ndarray/base/flags' ) );
 
+/**
+* @name flattenShape
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/base/flatten-shape}
+*/
+setReadOnly( ns, 'flattenShape', require( '@stdlib/ndarray/base/flatten-shape' ) );
+
 /**
 * @name fliplr
 * @memberof ns