Example of a bazel python/cpp binding that includes a transitive dependency.
//nativecontains a simple C++ library that has one function.//bindingcontains a pybind11 C++ binary that links to the function in//nativetest_binding.pyis a unit test that imports the binding and runs the included function. This requires that the transitively linked//nativelibrary also be loaded into the sandbox fortest_binding.py, solely through its dependence on//binding.