update license to use boilerplate copyright and add present to copyright notice

Author: duncanpharvey

LICENSE

@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2024 Datadog, Inc.
+   Copyright [yyyy] [name of copyright owner]
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

NOTICE

@@ -1,4 +1,4 @@
 Datadog terraform-aws-lambda-datadog
-Copyright 2024 Datadog, Inc.
+Copyright 2024-Present Datadog, Inc.
 
 This product includes software developed at Datadog (https://www.datadoghq.com/).