add cpp wrapper for QVE

Summary:
Pull Request resolved: #3525

Add c++ wrapper for instance segmentation

Reviewed By: zhanghang1989

Differential Revision: D31049697

fbshipit-source-id: 37db567468d1a72f73d3f8834684895e18666f0b

Author: wenliangzhao2018

detectron2/utils/visualizer.py

@@ -86,7 +86,7 @@ def __init__(self, mask_or_polygons, height, width):
 
         if isinstance(m, np.ndarray):  # assumed to be a binary mask
             assert m.shape[1] != 2, m.shape
-            assert m.shape == (height, width), m.shape
+            assert m.shape == (height, width), f"mask shape: {m.shape}, target dims: {height}, {width}"
             self._mask = m.astype("uint8")
             return