Update package-data to include pyi files (onnx#5697)

Update package-data to include pyi files. This change also cleans up the
MANIFEST.in file to remove duplicated entries and removes the
`examples/` folder because it is not used in the distribution.

Fixes onnx#5696

Signed-off-by: Justin Chu <[email protected]>

Author: justinchuby

MANIFEST.in

@@ -1,8 +1,5 @@
-recursive-include onnx *.h *.c *.cc *.proto
 recursive-include third_party *
 include LICENSE
-recursive-include onnx/backend/test/data *
-recursive-include onnx/examples *
 recursive-include cmake *
 recursive-include tools *
 include VERSION_NUMBER

pyproject.toml

@@ -38,9 +38,13 @@ include = ["onnx*"]
 
 [tool.setuptools.package-data]
 onnx = [
-    "py.typed",
-    "*.pyi",
+    "**/*.c",
+    "**/*.cc",
+    "**/*.h",
+    "**/*.proto",
+    "**/*.pyi",
     "backend/test/data/**/*",
+    "py.typed",
 ]
 
 [tool.pytest.ini_options]