feat: add promoteDataTypes to namespace

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---

Author: kgryte

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

@@ -715,6 +715,15 @@ setReadOnly( ns, 'outputPolicyStr2Enum', require( '@stdlib/ndarray/base/output-p
 */
 setReadOnly( ns, 'prependSingletonDimensions', require( '@stdlib/ndarray/base/prepend-singleton-dimensions' ) );
 
+/**
+* @name promoteDataTypes
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/base/promote-dtypes}
+*/
+setReadOnly( ns, 'promoteDataTypes', require( '@stdlib/ndarray/base/promote-dtypes' ) );
+
 /**
 * @name removeSingletonDimensions
 * @memberof ns