Add clear frame option in the annotator

[marktaipan-cvisionai]

Category Feature Request

Problem It can be very cumbersome to delete all the localizations in the current media/frame/version.

Request Add an option somewhere to clear all the localizations in the frame (either in the header or in the entity browser). Ideally there would be a warning modal that lists the frame, version, and corresponding localization counts for each type, and then the user can proceed or cancel. If there were no localizations in the frame, the button could either be disabled or the dialog would query and let the user know there are no localizations. The latter is likely easier to implement.