Added status for poki_sdk.commercial_break()
The rewarded_break() callback already has a REWARDED_BREAK_START status for when the video starts playing. This pull introduces the same for commercial_break().
This is a breaking change! Anyone using the commercial_break() callback will need to start checking the status parameter to know what the callback is being invoked for!
This change is useful for games that only want to pause gameplay when a video is actually being played.