Add native functions to module info

[garazdawi]

Is your feature request related to a problem? Please describe.
We need a way to get information about which functions in a module is backed by native code, both nifs or bifs.

Describe the solution you'd like
the funcion lists:module_info(native_functions) should return a list of functions that are implemented using native code. It should return both exported and private functions.

Additional context
#9010

[josevalim]

@garazdawi is there a reason to not use the current lists:module_info(nifs)? From an external point of view, NIFs vs BIFs are mostly an implementation detail, no? :)

[josevalim]

Alternatively, what about exposing -nifs under lists:module_info(attributes)? That would provide a quick way for fetching all NIFs, without having to traverse AST (or without having to load the module, as we could read it from the chunk).

[garazdawi]

is there a reason to not use the current lists:module_info(nifs)?

Nope, we can definitely use that for also BIFs. I just did not remember that it existed :)

Alternatively, what about exposing -nifs under lists:module_info(attributes)? That would provide a quick way for fetching all NIFs, without having to traverse AST (or without having to load the module, as we could read it from the chunk).

The -nifs attribute only shows which function could potentially be NIFs, and not which must be NIFs, so that cannot be used.