Inspect compiled CFFI extension members

To use a CFFI extension, its "lib" symbol gives access to the exported
C symbols and its "ffi" symbol gives access to low-level utilities.
An import such as the following is required:

  from _compiled_extension_module import ffi
  from _compiled_extension_module import lib

Then in the code, these objects are used to access the C symbols:

  pp = ffi.cast('struct mystruct *', p)
  lib.exported_c_function(pp)

Even if "_compiled_extension_module" is added to
AstroidManager.extension_package_whitelist, the "ffi" and "lib" objects
are not analyzed properly since they do not fall into any of the
supported categories of objects. A dummy "builtin.module" node is
inserted in their place preventing tools like pylint to properly detect
object membership. Thus producing invalid errors:

  Instance of 'module' has no 'cast' member [no-member]
  Instance of 'module' has no 'exported_c_function' member [no-member]

Both these objects define __all__ attributes which lists their exported
symbols. The presence of __all__ means that dir(member) will work and
that object_build may be called recursively on that member.

Insert a Module node to represent these objects and add their members to
the built AST.

Link: https://cffi.readthedocs.io/en/latest/overview.html#main-mode-of-usage
Signed-off-by: Robin Jarry <robin.jarry@6wind.com>

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