[IMP] tooling: add iife build to npm package

This is useful to link to the iife version in some other projects.

package.json

@@ -6,7 +6,8 @@
   "types": "dist/types/index.d.ts",
   "files": [
     "dist/types/",
-    "dist/owl.js"
+    "dist/owl.js",
+    "dist/owl-iife.js"
   ],
   "engines": {
     "node": ">=10.15.3"
@@ -24,7 +25,7 @@
     "pretools:watch": "npm run build",
     "tools:watch": "npm-run-all  --parallel tools:serve \"build:* -- --watch\"",
     "prettier": "prettier {src/*.ts,src/**/*.ts,tests/*.ts,tests/**/*.ts,doc/*.md,doc/**/*.md} --write",
-    "publish": "npm run buildcommonjs && npm publish",
+    "publish": "mv dist/owl.js dist/owl-iife.js && npm run buildcommonjs && npm publish",
     "release": "node tools/release.js"
   },
   "repository": {