fix: add TypeScript declaration for @lwrjs/api

Author: lesya7

src/lwrjs-api.d.ts

@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2023, salesforce.com, inc.
+ * All rights reserved.
+ * Licensed under the BSD 3-Clause license.
+ * For full license text, see LICENSE.txt file in the repo root or https://opensource.org/licenses/BSD-3-Clause
+ */
+
+/* eslint-disable */
+declare module '@lwrjs/api' {
+  export * from '@lwrjs/api/build/es/index.js';
+} 

tsconfig.json

@@ -6,5 +6,5 @@
     "skipLibCheck": true,
     "baseUrl": "."
   },
-  "include": ["./src/**/*.ts"]
+  "include": ["./src/**/*.ts", "./src/**/*.d.ts"]
 }