fix(packaging): stop setuptools from shipping tools/ and example/ in wheels

Disable implicit namespace discovery and exclude those dirs so dev-only
paths like `tools/gen_OX.sh` are not installed as top-level packages.

Signed-off-by: Mikel Olasagasti Uranga <mikel@olasagasti.info>

Author: mikelolasagasti

pyproject.toml

@@ -71,9 +71,12 @@ requires = ["setuptools>=77", "setuptools_scm[toml]>=6.2, != 8.0.0"]
 write_to = "codespell_lib/_version.py"
 
 [tool.setuptools.packages.find]
+namespaces = false
 exclude = [
     "dist",
     "snap",
+    "tools",
+    "example",
 ]
 
 [tool.setuptools.package-data]