Move setup requirements out of setup.py and into pyproject.toml and dev-requirements.txt (#950)

Changes:

* Move what was in the `setup_requires` field of `setup.py` into
`pyproject.toml`.

* Update the version of `setuptools` needed, to address a [recent
security scan
warning](https://github.com/quantumlib/qsim/security/code-scanning/86),
about a vulnerability in [setuptools versions before
78.1.1](GHSA-5rjg-fvgr-3xxf).

* Move the setuptools and Pybind requirements from `requirements.txt` to
`dev-requirements.txt`.

* Remove unused `typing_extensions` from `requirements.txt.

I also made a drive-by addition to `.editorconfig` to add an indentation
rule for `.toml` files.

Author: mhucka

.editorconfig

@@ -56,5 +56,8 @@ max_line_length = 88
 [*.sh]
 indent_size = 4
 
+[*.toml]
+indent_size = 2
+
 [{*.yaml,*.yml}]
 indent_size = 2

dev-requirements.txt

@@ -1,7 +1,12 @@
 cmake~=3.28.1
-black==25.9.0
+black~=25.9.0
+flynt~=1.0
 isort[colors]~=6.0.1
+# The global option to pybind11 makes it include CMake files in a location where
+# CMake will find them. It makes a crucial difference in some environments.
+pybind11[global]
 pylint~=4.0.2
 pytest
 pytest-xdist
 py-cpuinfo
+setuptools>=78.1.1

pyproject.toml

@@ -12,6 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+[build-system]
+requires = [
+  "packaging",
+  "setuptools>=78.1.1",
+  "pybind11[global]",
+  # "pip install" from sources needs to build Pybind, which needs CMake too.
+  "cmake~=3.28.1",
+]
+build-backend = "setuptools.build_meta"
+
 [tool.cibuildwheel]
 test-extras = "dev"
 dependency-versions = "latest"

requirements.txt

@@ -1,8 +1,3 @@
 absl-py
 cirq-core~=1.0
 numpy>=1.26.0
-# The global option to pybind11 makes it include CMake files in a location where
-# CMake will find them. It makes a crucial difference in some environments.
-pybind11[global]
-typing_extensions
-setuptools>=75.2.0

setup.py

@@ -146,13 +146,6 @@ def build_extension(self, ext):
     maintainer_email="[email protected]",
     python_requires=">=3.10.0",
     install_requires=requirements,
-    # "pip install" from sources needs to build Pybind, which needs CMake too.
-    setup_requires=[
-        "packaging",
-        "setuptools>=75.2.0",
-        "pybind11[global]",
-        "cmake~=3.28.1",
-    ],
     extras_require={
         "dev": dev_requirements,
     },