Add CI report of typehint completeness

.github/workflows/verify_types.yml

@@ -0,0 +1,31 @@
+name: Type completeness report
+
+on:
+  push:
+    branches: [development, maintenance]
+  pull_request:
+    branches: [development, maintenance]
+  workflow_dispatch:
+
+jobs:
+
+  verifytypes:
+    name: verifytypes
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: setup
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.11
+          architecture: x64
+
+      - name: Install
+        id: install
+        run: |
+          python -m pip install .[dev]
+      - name: "code-inspection: pyright --verifytypes"
+        # Suppress exit code because we do not expect to reach 100% type completeness any time soon
+        run: |
+          python -m pyright --verifytypes arcade || true