perf: use fast entry points on non-wheel install

This avoids importing `pkg_resources` on startup, which saves around 200
ms.

NOTE: wheel installer uses its own entry points template, which is the same
fastentrypoints.py script provides, so no gain there.

setup.py

@@ -3,6 +3,11 @@ from setuptools.command.build_py import build_py as _build_py
 import os
 import sys
 
+# Prevents pkg_resources import in entry point script,
+# see https://github.com/ninjaaron/fast-entry_points.
+# This saves about 200 ms on startup time for non-wheel installs.
+import fastentrypoints  # noqa: F401
+
 
 # https://packaging.python.org/guides/single-sourcing-package-version/
 pkg_dir = os.path.dirname(__file__)