feat: add fillSlice to namespace

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---

Author: kgryte

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

@@ -234,6 +234,15 @@ setReadOnly( ns, 'fill', require( '@stdlib/ndarray/fill' ) );
 */
 setReadOnly( ns, 'fillBy', require( '@stdlib/ndarray/fill-by' ) );
 
+/**
+* @name fillSlice
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/fill-slice}
+*/
+setReadOnly( ns, 'fillSlice', require( '@stdlib/ndarray/fill-slice' ) );
+
 /**
 * @name filter
 * @memberof ns