[feat] Add AggregatePointsFromTrajectoryOnline

Work the same way than offline version for the auto computation of the bounding box. Add a frame to the aggregation when a user change the time in the timeline (with cursor or play mode). Refact offline aggregation to avoid code duplication. Add security check in the voxel grid processor for online aggregation.

Slam documentation for aggregation updated here : keu-computervision/slam!253 (merged)