Generated ID is not always unique

[lars-reimann]

Describe the bug

If two functions/classes with the same name exist in a file, they may get the same ID. While such code is generally pointless, we should still account for it.

To Reproduce

Example code:

def f():
   pass

def f():
   pass

Expected behavior

A unique ID. We could add line and column number in the source file to the ID.

Screenshots (optional)

No response

Additional Context (optional)

No response