[ENHANCEMENT] Give an option to disable warnings

[shoumikchow]

Is your feature request related to a problem? Please describe.
The library outputs warnings (logging.WARNING) when the boxes are on the edge of the frame and it falls back to other forms of bbox style.

Describe the solution you'd like
A way to disable warnings permanently. This helps because the user might not prefer a lot of warnings in their outputs if the user is creating bboxes across many different images

[shoumikchow]

Fixed by #46