We need to think about how to export the metadata for the model

[yonatank93]

The YAML config file can be used to store the metadata. But, in the current version, we are missing the information about DataPrep.
So, we should add the following information, which also involve small modification in DataPrep:

1. EIS representations (no modification compared to Add other useful scripts from my production run #2 )
2. Number of frequency points. We need to change the input of the interpolation point, to now accept the original freq and Z, and the number of freq points. Then, we take the end points of the original freq, and generate the new freq points with the specified number of freq points.