Allow module patterns in discover_tasks_from_modules

That would allow to use discover_tasks_from_modules in ewokssphinx instead of private members: https://gitlab.esrf.fr/workflow/ewoks/ewokssphinx/-/blob/c85e3f6db077fd1d20db415bd709ec50bfd43354/src/ewokssphinx/ewoks_task_directive.py#L19