include source maps in npm pack

This commit includes the generated source maps in the artifact
published to npm. This commit also simplifies the patterns used
to match files. Some files, such as README are always included,
so it has been removed here.

Refs: https://docs.npmjs.com/cli/v11/configuring-npm/package-json#files
Fixes: #2249

Author: cjihrig

package.json

@@ -8,13 +8,9 @@
         "url": "https://github.com/kubernetes-client/javascript.git"
     },
     "files": [
-        "dist/*.ts",
-        "dist/*.js",
-        "dist/gen/*.ts",
-        "dist/gen/*.js",
-        "dist/gen/**/*.ts",
-        "dist/gen/**/*.js",
-        "README.md"
+        "dist/**/*.ts",
+        "dist/**/*.js",
+        "dist/**/*.map"
     ],
     "main": "dist/index.js",
     "types": "dist/index.d.ts",