Added new enum for out of stock visibility behaviour

Author: hendrix-ecwid

src/main/kotlin/com/ecwid/apiclient/v3/dto/product/enums/OutOfStockVisibilityBehaviour.kt

@@ -0,0 +1,8 @@
+package com.ecwid.apiclient.v3.dto.product.enums
+
+@Suppress("unused")
+enum class OutOfStockVisibilityBehaviour {
+	SHOW,
+	HIDE,
+	ALLOW_PREORDER
+}