feat: add dtypeChars to namespace

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---

Author: kgryte

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

@@ -328,6 +328,15 @@ setReadOnly( ns, 'dtype', require( '@stdlib/ndarray/base/dtype' ) );
 */
 setReadOnly( ns, 'dtypeChar', require( '@stdlib/ndarray/base/dtype-char' ) );
 
+/**
+* @name dtypeChars
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/base/dtype-chars}
+*/
+setReadOnly( ns, 'dtypeChars', require( '@stdlib/ndarray/base/dtype-chars' ) );
+
 /**
 * @name dtypeDesc
 * @memberof ns