chore: add codecov to CI

Author: allenporter

.github/workflows/ci.yml

@@ -52,8 +52,12 @@ jobs:
         run: poetry install
         shell: bash
       - name: Test with Pytest
-        run: poetry run pytest
+        run: poetry run pytest --cov=roborock --cov-branch --cov-report=xml
         shell: bash
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
   release:
     runs-on: ubuntu-latest
     needs: