Add CodeQL workflow configuration (#1962)

This pull request introduces a new GitHub Actions workflow to enable
advanced CodeQL security analysis for the repository. The workflow is
triggered on pushes, pull requests, and a weekly schedule, and it
supports multiple languages.

Security and CI improvements:

* Added a `.github/workflows/codeql.yml` workflow that runs CodeQL
analysis for `actions` and `python` code on main branch pushes, pull
requests, and on a weekly schedule. The workflow checks out the code,
initializes CodeQL for each language, and performs security analysis,
with results uploaded to GitHub Security tab.

Author: iMicknl

.github/workflows/codeql.yml

@@ -0,0 +1,40 @@
+name: "CodeQL Advanced"
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    - cron: '18 3 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ${{ (matrix.language == 'swift' && 'macos-latest') || 'ubuntu-latest' }}
+    permissions:
+      security-events: write
+      packages: read
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - language: actions
+          build-mode: none
+        - language: python
+          build-mode: none
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v4
+      with:
+        languages: ${{ matrix.language }}
+        build-mode: ${{ matrix.build-mode }}
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v4
+      with:
+        category: "/language:${{matrix.language}}"