Add a fact module to get information about python3 installations

Signed-off-by: Aurélien Bompard <aurelien@bompard.org>

library/python3_fact.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+
+from distutils.sysconfig import get_python_lib
+
+from ansible.module_utils.basic import AnsibleModule
+
+
+DOCUMENTATION = r'''
+---
+module: python3_fact
+
+short_description: Add Ansible facts about the Python3 installation
+
+# If this is part of a collection, you need to use semantic versioning,
+# i.e. the version is of the form "2.5.0" and not "2.4".
+version_added: "1.0.0"
+
+description: Ansible facts will be added about the following Python3
+
+author:
+    - Aurelien Bompard (@abompard)
+'''
+
+EXAMPLES = r'''
+# In ansible.cfg
+
+facts_modules = smart, python3_fact
+
+# Ansible facts dump:
+
+$ ansible -m debug -a var=ansible_facts hostname
+"ansible_facts": {
+    ...
+    "python3": {
+        "sitelib": "/usr/lib/python3.11/site-packages"
+    },
+    ...
+}
+'''
+
+RETURN = r'''
+sitelib:
+    description: The full path to the site-packages directory.
+    type: str
+    returned: always
+    sample: '/usr/lib/python3.11/site-packages'
+'''
+
+
+def run_module():
+    result = {
+        "sitelib": get_python_lib(),
+    }
+    module = AnsibleModule(
+        argument_spec={},
+        supports_check_mode=True
+    )
+    module.exit_json(changed=False, ansible_facts=dict(python3=result))
+
+
+def main():
+    run_module()
+
+
+if __name__ == '__main__':
+    main()