feat: add entrypoint for cmake modules dir

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

setup.py

@@ -144,6 +144,7 @@ def remove_output(*sources: str) -> Iterator[None]:
             stdout=sys.stdout,
             stderr=sys.stderr,
         )
+        Path("pybind11/share/cmake/pybind11/__init__.py").touch()
 
     txt = get_and_replace(setup_py, version=version, extra_cmd=extra_cmd)
     code = compile(txt, setup_py, "exec")

tools/setup_main.py.in

@@ -38,6 +38,9 @@ setup(
         ],
         "pipx.run": [
              "pybind11 = pybind11.__main__:main",
+        ],
+        "cmake.modules": [
+            "pybind11 = pybind11.share.cmake.pybind11",
         ]
     },
     cmdclass=cmdclass