feat: add rangeBy to namespace

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---

Author: kgryte

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

@@ -576,6 +576,15 @@ setReadOnly( ns, 'nanminabs', require( '@stdlib/stats/base/ndarray/nanminabs' )
 */
 setReadOnly( ns, 'range', require( '@stdlib/stats/base/ndarray/range' ) );
 
+/**
+* @name rangeBy
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/range-by}
+*/
+setReadOnly( ns, 'rangeBy', require( '@stdlib/stats/base/ndarray/range-by' ) );
+
 /**
 * @name scovarmtk
 * @memberof ns