Add support for adding or modifying PE's LoadConfiguration

[cmdstack]

Describe the bug
Need to create Load Configuration when does not exist.
Need to update existing Load Configuration.

To Reproduce
Load your PE first to myPE

>>> load_config = lief.PE.LoadConfiguration()
>>> myPE.load_configuration = load_config
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: property of 'Binary' object has no setter

Expected behavior
No error, update the PE.

Environment (please complete the following information):
NA

Additional context
NA

NOTICE

If the issue does not contain enough information to be reproduced,
it will be flagged as incomplete
and closed.

/NOTICE

[romainthomas]

Yes currently LIEF does not support adding or modifying PE's load config structure.