chore: Make pyproject.toml conform to maturin

This should avoid the awkward situation of using the official tool for
pyo3 projects not building the python bindings

Author: Waelwindows

pyproject.toml

@@ -1,3 +1,15 @@
+[project]
+name = "objset"
+dependencies = ["cffi"]
+requires-python = ">=3.6"
+
+[project.urls]
+"Source Code" = "https://github.com/Waelwindows/objset"
+Issues = "https://github.com/Waelwindows/objset/issues"
+
 [build-system]
 requires = ["maturin>=0.10,<0.11"]
 build-backend = "maturin"
+
+[tool.maturin]
+cargo-extra-args = "--all-features"