feat: add nanrangeBy and rangeBy to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/stats/array/lib/index.js

@@ -333,6 +333,15 @@ setReadOnly( ns, 'nanmskrange', require( '@stdlib/stats/array/nanmskrange' ) );
 */
 setReadOnly( ns, 'nanrange', require( '@stdlib/stats/array/nanrange' ) );
 
+/**
+* @name nanrangeBy
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/array/nanrange-by}
+*/
+setReadOnly( ns, 'nanrangeBy', require( '@stdlib/stats/array/nanrange-by' ) );
+
 /**
 * @name range
 * @memberof ns
@@ -342,6 +351,15 @@ setReadOnly( ns, 'nanrange', require( '@stdlib/stats/array/nanrange' ) );
 */
 setReadOnly( ns, 'range', require( '@stdlib/stats/array/range' ) );
 
+/**
+* @name rangeBy
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/array/range-by}
+*/
+setReadOnly( ns, 'rangeBy', require( '@stdlib/stats/array/range-by' ) );
+
 /**
 * @name varianceyc
 * @memberof ns