ci: Add Python linting

.flake8

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+[flake8]
+max-line-length = 120

.github/workflows/script_lint.yml

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+---
+name: Script Lint
+on:
+  pull_request:
+    paths:
+      - 'common/**'
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+jobs:
+  Python:
+    name: Python Linting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out source repository
+        uses: actions/checkout@v4
+      - name: Set up Python environment
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.10"
+      - name: flake8 Lint
+        uses: py-actions/flake8@v2
+        with:
+           path: "common/CI"