Write a WESPE readout

[zain-sohail]

We now realize that WESPE is different enough from the HEXTOF readout that it requires a new loader.

[zain-sohail]

Earlier, Lukas was taking the the final df from flashloader (so say electron resolved dataframe from multiple runs) and we were allowing it to be saved as a parquet file using save_parquet
He was then appending some new column taking like energy some simulated data and calibration on matlab.
Lastly, this data was being loaded back into sed using load_parquet

Now, we will port the code to matlab code to python and remove this complicated file loading behavior, which was creating a lot of bugs.

Originally posted by @zain-sohail in #329 (comment)