[P] GLIP + SAM for zero-shot instance segmentation

GLIP (https://github.com/microsoft/GLIP), which i feel has flown under the radar, is capable of zero-shot object detection. i threw together a notebook that pairs it with the recently released Segment Anything Model (https://github.com/facebookresearch/segment-anything) to do zero-shot instance segmentation: https://colab.research.google.com/drive/1kfdizAJiD5_t-M6yFBB6t2vzGrYg8SJc