Reason string for todo() like on skip()

[Schrolli91]

Just an idea from my side...

The output is currently showing, if a test is skipped or marked as todo.
How about to give the todo() method a string, with a short reason why this is todo.
Same as on the skipped tests.

e.g.:

arch('models')->todo('add suffix')
->expect('App\Models')
->toHaveSuffix('Model')
->toBeClasses();

And then render this message inside the output of the testsuite