chore: create devcontainer setup

.devcontainer/Dockerfile

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+# Dev container Dockerfile
+FROM mcr.microsoft.com/devcontainers/universal:4-noble
+
+# Install essential utilities including coreutils
+RUN apt-get update && apt-get install -y \
+    coreutils \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Poetry
+RUN curl -sSL https://install.python-poetry.org | python3 -

.devcontainer/devcontainer.json

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+{
+  "name": "Langfuse Python SDK",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "containerEnv": {
+    "PATH": "/root/.local/bin:$PATH"
+  },
+  "postCreateCommand": "poetry self add poetry-dotenv-plugin && poetry self add poetry-bumpversion && poetry install --all-extras && poetry run pre-commit install && cp .env.template .env"
+}