Add support for functions without arguments

[jan-janssen]

Example:

import subprocess
from pyiron_base import Project 

def get_python_version():
    return subprocess.check_output("python --version", shell=True, universal_newlines=True)

pr = Project("test")
python_version = pr.wrap_python_function(
    python_function=get_python_version,
    delayed=True,
)
python_version.pull()
>>> 'Python 3.12.5\n'