bindings/javascript: Generate native npm packages at publish

Use the `napi create-npm-dirs` command to create the native packages and
remove the manually created ones. Unlocks wasm publish.

.github/workflows/napi.yml

@@ -228,6 +228,8 @@ jobs:
           node-version: 20
       - name: Install dependencies
         run: yarn install
+      - name: create npm dirs
+        run: yarn napi create-npm-dirs
       - name: Download all artifacts
         uses: actions/download-artifact@v4
         with: