get_rid_grid function seems incomplete

[sumitmishra209]

Please note that the code of "get_rid_grid" in models_utils.py is incomplete, and the part that calculates the grid cell indices for the intermediate coordinates is missing. Additionally, the calculated mid_xid and mid_yid values are not used anywhere in the code, so this part of the code would need to be completed and integrated into the rest of the logic to correctly handle the intermediate grid cells between two consecutive points.