chore(ci): automate npm publishing (#22)

* chore(ci): automate NPM publishing

* chore: remove unnecessary files

Author: dgellow

.github/CODEOWNERS

@@ -0,0 +1,31 @@
+name: Publish Package to npmjs
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+          registry-url: 'https://registry.npmjs.org'
+          scope: '@stainless-api'
+          cache: 'yarn'
+
+      - run: yarn install --frozen-lockfile
+
+      - run: yarn build
+
+      - run: yarn test
+
+      - run: yarn workspaces foreach --no-private npm publish --provenance --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}