Add one test for pyproject

Author: rgaiacs

tests/pyproject/pyproject-toml/README.rst

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+Python - pyproject.toml
+-----------------------
+
+``pyproject.toml`` should be used over ``setup.py``.

tests/pyproject/pyproject-toml/mwt/__init__.py

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+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "mwt"
+version = "1.0.0"
+dependencies = [
+  "numpy",
+]
+requires-python = ">=3.12"
+authors = [
+  {name = "Project Jupyter Contributors", email = "[email protected]"},
+]
+maintainers = [
+  {name = "Project Jupyter Contributors", email = "[email protected]"},
+]
+description = "Test for repo2docker"
+readme = "README.rst"
+license = "MIT"
+
+[project.urls]
+Homepage = "https://repo2docker.readthedocs.io/"
+Documentation = "https://repo2docker.readthedocs.io/"
+Repository = "https://github.com/jupyterhub/repo2docker.git"
+"Bug Tracker" = "https://github.com/jupyterhub/repo2docker/issues"

tests/pyproject/pyproject-toml/pyproject.toml

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+#!/usr/bin/env python
+try:
+    import mwt
+except ImportError:
+    raise Exception("'mwt' shouldn't have been installed!")