(cpp) Add C++ query implementation

.devcontainer/cpp/devcontainer-lock.json

@@ -0,0 +1,82 @@
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+        "ghcr.io/devcontainer-community/devcontainer-features/danmar-cppcheck:latest",
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+        "ghcr.io/devcontainer-community/devcontainer-features/clang-tidy:latest",
+        "ghcr.io/devcontainer-community/devcontainer-features/distcc.org:latest",
+        "ghcr.io/devcontainer-community/devcontainer-features/vcpkg.io:latest",
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+    },
+    "ghcr.io/devcontainers-extra/features/gcovr:1": {
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+    }
+  }
+}

.devcontainer/cpp/devcontainer.json

@@ -0,0 +1,35 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/ubuntu
+{
+	"name": "cpp",
+	"image": "mcr.microsoft.com/devcontainers/base:resolute",
+	"features": {
+		"ghcr.io/devcontainer-community/devcontainer-features/collection-c-cpp:1": {},
+		"ghcr.io/devcontainers-extra/features/gcovr:1": {}
+	},
+	"customizations": {
+		"vscode": {
+			"settings": {
+				"clangd.arguments": [
+					"--compile-commands-dir=${userHome}/.cpp"
+				],
+				"cmake.copyCompileCommands": "${userHome}/.cpp/compile_commands.json",
+				"cmake.sourceDirectory": "${workspaceFolder}/cpp",
+				"cmake.useCMakePresets": "auto",
+				"cmake.postRunCoverageTarget": "generate-lcov-report",
+				"cmake.coverageInfoFiles": [
+					"${workspaceFolder}/cpp/build/coverage/lcov.info"
+				]
+			},
+			"extensions": [
+				"llvm-vs-code-extensions.vscode-clangd",
+				"ms-vscode.cmake-tools",
+				"ms-vscode.cpptools"
+			]
+		}
+	},
+	"remoteEnv": {
+		"CPM_SOURCE_CACHE": "~/cache/.cpm",
+		"DEBUGINFOD_URLS": ""
+	}
+}

.devcontainer/devcontainer.json

@@ -0,0 +1,22 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/alpine
+{
+	"name": "Alpine",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/base:alpine-3.22"
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "uname -a",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.github/workflows/codeql-cpp.yaml

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+name: codeql-cpp
+
+permissions: {}
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - cpp/**
+      - testdata/**
+      - .github/**
+  pull_request:
+    branches:
+      - main
+    paths:
+      - cpp/**
+      - testdata/**
+      - .github/**
+  schedule:
+    - cron: '48 5 * * 0'
+
+concurrency:
+  # Cancels in-progress runs only for pull requests
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  analyze:
+    name: Analyze C++
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+    env:
+      # Git ref (tag, branch, or SHA) of the cucumber_messages dependency to
+      # build against. Must match the version required in cpp/CMakeLists.txt and
+      # cpp/conanfile.py, or the messages branch under test.
+      MESSAGES_REF: 8cd6cacecd0a657095c93b069c850f51009e0499
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@d62db5f07c26379fc4b4e0916f098a92573c3b03 # v1.2.23
+        with:
+          key: ${{ github.job }}-${{ github.ref }}
+          append-timestamp: false
+          save: ${{ github.ref == 'refs/heads/main' }}
+
+      - name: Checkout cucumber/messages
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          repository: cucumber/messages
+          ref: ${{ env.MESSAGES_REF }}
+          path: messages-src
+          persist-credentials: false
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ccache nlohmann-json3-dev
+
+      - name: Build and install cucumber_messages
+        working-directory: messages-src/cpp
+        run: |
+          cmake --workflow --preset host-system
+          sudo cmake --install build/host-system
+
+      - uses: github/codeql-action/init@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6
+        with:
+          languages: c-cpp
+          build-mode: manual
+          tools: linked
+
+      - name: Configure
+        working-directory: cpp
+        run: cmake --workflow --preset host-system
+
+      - uses: github/codeql-action/analyze@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6
+        with:
+          category: "/language:cpp"