Switch build from hatchling to setuptools

Replaces `tox` with hatch environments
Replaces setuptools_scm with hatch-vcs (https://github.com/ofek/hatch-vcs)

Testing with `hatch` is vastly faster than with tox,
because it uses `uv` instead of virtualenv and pip.

Author: Techcable

Justfile

@@ -29,21 +29,10 @@ mypy:
     uv run mypy src
 
 # runs tests without anything else
-_test: test-single
-    @just _test_ver 3.13
-    @just _test_ver 3.12
-    @just _test_ver 3.11
-    @just _test_ver 3.10
-    @just _test_ver 3.9
+_test:
+    hatch test --all
 
 
-# runs python tests for a specific version
-_test_ver pyver:
-    # running tests for python {{pyver}}
-    @# NOTE: Using `uv` is vastly faster than using `tox`
-    @# Using --isolated avoids clobbering dev environment
-    @uv run --isolated --python {{pyver}} --only-group test pytest --quiet
-
 # Check for spelling issues
 spellcheck:
     # Check for obvious spelling issues

pyproject.toml

@@ -24,6 +24,7 @@ pydantic = [
 
 [dependency-groups]
 mypy = ["mypy~=1.0", { include-group = "typing" }]
+# keep in sync with [tool.hatch.envs] until hatch supports PEP 754
 test = [
     "pytest~=8.3",
     "pytest-asyncio>=0.26",
@@ -38,19 +39,38 @@ Source = "https://github.com/Techcable/orderedset.py"
 
 [build-system]
 requires = [
-    "setuptools>=61.0",
-    "setuptools_scm[toml]>=6.2",
+    "hatchling",
+    "hatch-vcs",
 ]
-build-backend = "setuptools.build_meta"
+build-backend = "hatchling.build"
 
-[tool.isort]
-profile = "black"
 
-[tool.setuptools_scm]
+[tool.hatch.version]
+source = "vcs"
+
+[tool.hatch.envs.hatch-test]
+# use uv instead of venv/pip
+installer = "uv"
+# Keep in sync with dependency-groups until hatch supports PEP 754
+# See pypa/hatch#1852
+dependencies = [
+    "pytest~=8.3",
+    "pytest-asyncio>=0.26",
+    "pytest-sugar~=1.0",
+]
+extra-dependencies = ["pydantic"]
+
+[[tool.hatch.envs.hatch-test.matrix]]
+python = ["3.9", "3.10", "3.11", "3.12", "3.13"]
+
+[tool.hatch.build.hooks.vcs]
 # NOTE: Using a version file avoids some overhead
 #
 # This file is explicitly ignored by version control.
-write_to = "src/techcable/orderedset/_version.py"
+version-file = "src/techcable/orderedset/_version.py"
+
+[tool.isort]
+profile = "black"
 
 [tool.ruff]
 line-length = 120