##### SUMMARY
Support become unprivileged user on macOS without `allow_world_readable_tmpfiles=true`

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
action, shell, and copy

##### ADDITIONAL INFORMATION
When using become where the login user and the become user are both unprivileged, Ansible attempts to securely change file permissions to only allow the become user to read the files. It uses `setfacl` and falls back to `chown`. Both of these fail on macOS, as there is no `setfacl` command and `chown` is not permitted.

macOS actually does provide the same functionality as `setfacl`, using `chmod +a`. The syntax is a bit different from `setfacl`, but it should be able to do what Ansible needs.
self.assertEqual(action_base._transfer_data('/path/to/remote/file', dict(some_key='fö〩')), '/path/to/remote/file')
        mock_afo.write.side_effect = Exception()
        self.assertRaises(AnsibleError, action_base._transfer_data, '/path/to/remote/file', '')
    def test_action_base__execute_remote_stat(self):
        
        mock_task = MagicMock()
        
        mock_connection = MagicMock()
        
        play_context = PlayContext()
        
        action_base = DerivedActionBase(
            task=mock_task,
            connection=mock_connection,
            play_context=play_context,
            loader=None,
            templar=None,
            shared_loader_obj=None,
        )
        action_base._execute_module = MagicMock()
        # test no
        action_base._execute_module.return_value = dict(stat=dict(checksum='1111111111111111111111111111111111', exists=True))
        res = action_base._execute_remote_stat(path='/path/to/file', all_vars=dict(), follow=False)
        self.assertEqual(res['checksum'], '1111111111111111111111111111111111')
        # test do
        action_base._execute_module.return_value = dict(stat=dict(exists=False))
        res = action_base._execute_remote_stat(path='/path/to/file', all_vars=dict(), follow=False)
        self.assertFalse(res['exists'])
        self.assertEqual(res['checksum'], '1')
        # test no