ci: Add github action to make sure changelog for @excalidraw/excalidraw is updated (#2518)

Add guidelines for changelog and group the commits
update the changelog with the latest commits since the last release
Co-authored-by: Lipis <lipiridis@gmail.com>

.github/workflows/changelog-check.yml

@@ -0,0 +1,26 @@
+name: Changelog in sync for packages
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Setup Node.js 12.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+
+      - name: Install and run changelog check
+        run: |
+          npm ci
+          npm run changelog:check
+        env:
+          CI: true