chore: added header in main.wat file

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
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    status: passed
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---

Author: 0PrashantYadav0

lib/node_modules/@stdlib/stats/strided/wasm/dmeanpw/src/main.wat

@@ -1,3 +1,19 @@
+;; @license Apache-2.0
+;;
+;; Copyright (c) 2025 The Stdlib Authors.
+;;
+;; Licensed under the Apache License, Version 2.0 (the "License");
+;; you may not use this file except in compliance with the License.
+;; You may obtain a copy of the License at
+;;
+;;    http://www.apache.org/licenses/LICENSE-2.0
+;;
+;; Unless required by applicable law or agreed to in writing, software
+;; distributed under the License is distributed on an "AS IS" BASIS,
+;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+;; See the License for the specific language governing permissions and
+;; limitations under the License.
+
 (module
   (type (;0;) (func (param i32 i32 i32 i32) (result f64)))
   (type (;1;) (func))