pyverbs: Expose some C objects

Expose the underlying C object of Context and Mlx5DevxObj objects by
adding an appropriate property to their classes.

Signed-off-by: Daria Velikovsky <daria@nvidia.com>
Signed-off-by: Edward Srouji <edwards@nvidia.com>

pyverbs/device.pyx

@@ -177,6 +177,10 @@ cdef class Context(PyverbsCM):
                 raise PyverbsRDMAErrno(f'Failed to close device {self.name}')
             self.context = NULL
 
+    @property
+    def context(self):
+        return <object>self.context
+
     @property
     def num_comp_vectors(self):
         return self.context.num_comp_vectors

pyverbs/providers/mlx5/mlx5dv.pyx

@@ -234,6 +234,10 @@ cdef class Mlx5DevxObj(PyverbsCM):
     def out_view(self):
         return self.out_view
 
+    @property
+    def obj(self):
+        return <object>self.obj
+
     def __dealloc__(self):
         self.close()