Add example and tests for Python directory option

examples/python-directory/.gitignore

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+
+# Devenv
+.devenv*
+devenv.local.nix
+

examples/python-directory/.test.sh

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+#!/usr/bin/env bash
+set -exu
+POETRY_VENV="$PWD/directory/.venv"
+[ -d "$POETRY_VENV" ]
+[ "$(poetry env info --path)" = "$POETRY_VENV" ]
+[ "$(command -v python)" = "$POETRY_VENV/bin/python" ]
+python --version
+poetry --version
+poetry run python -c 'import requests'
+python -c 'import requests'

examples/python-directory/devenv.nix

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+{ pkgs, config, ... }:
+
+{
+  languages.python = {
+    enable = true;
+    directory = "./directory";
+    poetry = {
+      enable = true;
+      install.enable = true;
+      activate.enable = true;
+    };
+  };
+}

examples/python-directory/devenv.yaml

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+---
+
+inputs:
+  nixpkgs:
+    url: github:NixOS/nixpkgs/nixpkgs-unstable
+  nixpkgs-python:
+    url: github:cachix/nixpkgs-python

examples/python-directory/directory/pyproject.toml

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+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.poetry]
+name = "python-directory"
+version = "0.1.0"
+description = ""
+authors = [
+    "Bob van der Linden <bobvanderlinden@gmail.com>",
+    "Matthias Thym <git@thym.at>"
+]
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = "^3.11"
+requests = "^2.30"