add header to sasimplutiltests

Author: browndav-msft

sdk/storage/azure-storage-common/src/test/java/com/azure/storage/common/implementation/SasImplUtilsTests.java

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
 package com.azure.storage.common.implementation;
 
 import org.junit.jupiter.api.BeforeEach;