[Python Frontend] Regression on attribute replacement when used in LHS assigns

[FlorianDeconinck]

import numpy as np
import dace


@dace.program
def runtime(arr) -> None:
    arr.flat[:] += 1  # <--- Regression: left hand side assign fails
    return arr.flat[:]  # Right hand side still works


if __name__ == "__main__":
    arr = np.ones((3, 3))
    runtime(arr)
    assert (arr[:] == 2).all()

LHS of assign are failing at parsing times, probably in connetion with the struct work

  File "/home/fgdeconi/work/git/ndsl/external/dace/dace/sdfg/sdfg.py", line 56, in __getitem__
    result = result.members[token]
             ^^^^^^^^^^^^^^
AttributeError: 'Array' object has no attribute 'members'