feat: add inputCastingPolicies to namespace

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---

Author: kgryte

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

@@ -270,6 +270,15 @@ setReadOnly( ns, 'ndindex', require( '@stdlib/ndarray/index' ) );
 */
 setReadOnly( ns, 'indexModes', require( '@stdlib/ndarray/index-modes' ) );
 
+/**
+* @name inputCastingPolicies
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/input-casting-policies}
+*/
+setReadOnly( ns, 'inputCastingPolicies', require( '@stdlib/ndarray/input-casting-policies' ) );
+
 /**
 * @name iter
 * @memberof ns