Dino model

Finalized DINO model architecture split into three main files:

• dino.py containing the DINONet and Spec classes
• layers.py containing the inner layers that the DINI model builds on top: DINO Back Bone ( vision Transfomer) and DINO head (projection head)
• utils.py containing utility functions that the different DINO modules use

and a testing script under test_dinonet.py, which displays the DINO model in action against image data.

@OmarJabri7 That's a great work you did, can you message me when this is merged so that we can have a blog post draft about it?