Add class for loading data into python for analysis

[dsuplica]

Proposed idea: a new class responsible for loading and storing experiment data. This would be analagous to the EEG_decoder "experiment object"

It may be convenient to have it fully in this pipeline, which could make it easier to update it if we make any pipeline changes

Options:

1) Custom class that just does loading / basic handling (like Experiment class)

• advantage: easily compatible with EEG_decoder and easy to extend

2) Mne Epochs class

• advantage: compatible with mne suite
• disadvantage: may be harder to extend or add features
• disadvantage: not really compatible with EEG_decoder
  • could be fixed by adding compatibility functions

3) don't do this

• advantage: may be easier to have experiment handling done together with data analysis
  • could simply update EEG_decoder Experiment to be compatible with this
• however, if we are trying to standardize dataset formatting it may be ideal to just have this here

[dsuplica]

after discussing we will be keeping this in wrangler