Add augment_bounding_boxes support to CutMix layer

[divyashreepathihalli]

The augment_bounding_boxes should be implemented for CutMix Layer in keras_cv. The PR should contain implementation, test scripts and a demo script to verify implementation.

Example code for implementing augment_bounding_boxes() can be found here

• https://github.com/keras-team/keras-cv/blob/master/keras_cv/layers/preprocessing/random_flip.py#:~:text=def%20augment_bounding_boxes(,)%3A
• https://github.com/keras-team/keras-cv/blob/master/keras_cv/layers/preprocessing/random_rotation.py#:~:text=def%20augment_image(self%2C%20image%2C%20transformation%2C%20**kwargs)%3A
• The implementations can be verified using demo utils in keras_cv.bounding_box - Example of demo script can be found here : https://github.com/keras-team/keras-cv/blob/master/examples/layers/preprocessing/bounding_box/random_rotation_demo.py

[AdonaiVera]

@divyashreepathihalli Is this issue still welcoming contributions? If yes, then can I contribute ?

[divyashreepathihalli]

@AdonaiVera, thank you for willing to contribute. However, after discussing this with the team, we have decided that we do not need to add the augment bounding box capability to CutMix. Instead, we will recommend that users utilize the Mosaic() layer. I will be closing this issue.