Add GitHub actions: windows unit tests

Author: robsdedude

.github/CODEOWNERS

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+/.github/CODEOWNERS @neo4j/drivers
+/.github/workflows/ @neo4j/drivers

.github/workflows/tests.yaml

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+name: Tests
+
+on:
+  push:
+    branches:
+      - '6.x'
+  pull_request:
+    branches:
+      - '6.x'
+
+jobs:
+  win-unit-tests:
+    name: Windows Unit Tests
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        python-version:
+          - '3.10'
+          - '3.11'
+          - '3.12'
+          - '3.13'
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8  # v5.0.0
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c  # v6.0.0
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+
+      - name: Run unit tests
+        run: python testkit/unittests.py
+
+  gha-conclusion:
+    name: GHA Conclusion
+    runs-on: ubuntu-latest
+    needs: win-unit-tests