Add Bounding Box Utils

[sineeli]

Added below utils for bounding boxes:

• [x] converters
• [x] to_dense
• [x] to_ragged

Future utils needed to be added:

• [ ] iou
• [ ] mask_invalid_detections
• [ ] ensure_tensor
• [ ] extra utils

[mattdangerw]

Please run format!

@divyashreepathihalli this is the temporary move to keras-hub right?

[sineeli]

Please run format!

I did run the format but seems the error is coming from api_gen. I even ran api_gen.sh but not sure what is causing the error.

Thanks for the review, I will resolve the issues mentioned.

Thanks!

[divyashreepathihalli]

looks like it needs shell/api_gen.sh, maybe try it again?

[divyashreepathihalli]

Please run format!

@divyashreepathihalli this is the temporary move to keras-hub right?

Yes! this should be temporary until they are added to keras core