feat: add isDataTypeString to namespace

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---

Author: kgryte

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

@@ -153,6 +153,15 @@ setReadOnly( ns, 'isContiguous', require( '@stdlib/ndarray/base/assert/is-contig
 */
 setReadOnly( ns, 'isDataType', require( '@stdlib/ndarray/base/assert/is-data-type' ) );
 
+/**
+* @name isDataTypeString
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/base/assert/is-data-type-string}
+*/
+setReadOnly( ns, 'isDataTypeString', require( '@stdlib/ndarray/base/assert/is-data-type-string' ) );
+
 /**
 * @name isFloatingPointDataType
 * @memberof ns