Add GitHub Actions CI workflow and update menu tests

This commit adds a GitHub Actions workflow for continuous integration
testing on macOS platforms and updates the menu tests to use the new API
with method-based property access instead of direct property access.
Also removes the comprehensive AppRunner test suite.

Author: lijy91

.github/workflows/test.yml

@@ -0,0 +1,45 @@
+name: Test
+
+on:
+  push:
+    branches: [main, master, develop]
+  pull_request:
+    branches: [main, master, develop]
+
+jobs:
+  test:
+    name: Test on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, macos-12]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Setup Xcode
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: latest-stable
+
+      - name: Cache Swift packages
+        uses: actions/cache@v3
+        with:
+          path: |
+            .build
+            ~/Library/Caches/org.swift.swiftpm
+          key: ${{ runner.os }}-spm-${{ hashFiles('**/Package.resolved') }}
+          restore-keys: |
+            ${{ runner.os }}-spm-
+
+      - name: Build
+        run: swift build
+
+      - name: Run tests
+        run: swift test --parallel
+
+      - name: Build example
+        run: swift build --product Example