Support native pointer type

[emesare]

Currently POINTER class types (see ctypes doc) are not supported. To allow these to be supported we need the following:

• A way to specify the "default" pointer width within the code (think: set_native_pointer_size(8)), this is very important as existing ctypes structures do not account for any specific pointer width and instead the pointer width of the system in which it is running in.
• Accessible address value (see notice in py_from_bytes)

  memflow-py/src/internal.rs

  Line 80 in 5e40673

  todo!("Need to store address in an attribute to access later")