internal: refactor for packaging

Package using python-build, python-installer and hatch

pyproject.toml

@@ -0,0 +1,14 @@
+[build-system]
+requires = ["hatchling", "hatch-vcs"]
+build-backend = "hatchling.build"
+
+[project]
+name = "caelestia"
+requires-python = ">=3.13"
+dynamic = ["version"]
+
+[project.scripts]
+caelestia = "caelestia:main"
+
+[tool.hatch.version]
+source = "vcs"