Added sequential visualization of all .bin files in directory

[MANASNANDMOHAN]

feat: Add sequential visualization support for directories containing multiple .bin files Description

This PR significantly improves the visualization pipeline in OpenPCDet by introducing sequential rendering of multiple .bin files in a directory. It enhances the usability and performance of the visualizer, especially for use cases involving LiDAR sequence visualization, such as autonomous driving datasets.

sequential_visualization.webm