feat: add toUniqueNormalizedIndices to namespace

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---

Author: kgryte

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

@@ -859,6 +859,15 @@ setReadOnly( ns, 'toNormalizedIndices', require( '@stdlib/ndarray/base/to-normal
 */
 setReadOnly( ns, 'toReversed', require( '@stdlib/ndarray/base/to-reversed' ) );
 
+/**
+* @name toUniqueNormalizedIndices
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/base/to-unique-normalized-indices}
+*/
+setReadOnly( ns, 'toUniqueNormalizedIndices', require( '@stdlib/ndarray/base/to-unique-normalized-indices' ) );
+
 /**
 * @name transpose
 * @memberof ns