Add initial devcontainer support

.devcontainer/.dockerignore

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+node_modules
+.pytest_cache
+ms-python-insiders.vsix

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/python:0-3.10
+
+RUN apt-get update
+# RUN apt-get install -y libatk1.0-0 libatk-bridge2.0-0 libdrm2 libgtk-3-0 libgbm-dev libasound2

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/python
+{
+    "name": "Python 3",
+    // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+    "build": {
+        "dockerfile": "./Dockerfile",
+        "context": ".."
+    },
+    // 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": "npm install ; npm run compile",
+    "features": {
+        "ghcr.io/devcontainers/features/node:1": {
+            "nodeGypDependencies": true,
+            "version": "16"
+        }
+    },
+    // Configure tool-specific properties.
+    // "customizations": {},
+    // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+    // "remoteUser": "root"
+}