feat: Save CEA708 caption cues on all windows when deleting/clearing windows #7909
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Addresses #7907
While Shaka's CEA708 parser currently creates each simultaneous subtitle cue window individually via
defineWindow_(), Shaka emits the simultaneous captions all at once viadeleteWindows_(). Only the last cue with the same start/end time is saved. The others are overwritten bydeleteWindows_().This PR addresses the above asymmetry by saving all cues on windows with the same start/end time when deleting/clearing windows. A slight refactoring was needed to use arrays to hold more than one parsed caption when handling C1 group data.