Add devcontainer

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/python:3.11-bullseye
+RUN apt-get update && apt-get upgrade -y
+RUN pip install pip-tools invoke
+COPY requirements.in requirements.txt requirements-dev.in requirements-dev.txt constraints.txt tasks.py ./
+RUN invoke sync-dependencies

.devcontainer/devcontainer.json

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+{
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": ".."
+  },
+  "postStartCommand": "inv sync-dependencies && pre-commit install --install-hooks"
+}