[Dataset Prep] Add standard ERP/ERSP and other standard analysis to StudyTemplate

[Andesha]

Build group level statistics notebook for emulating results/discussion section of a study

[Andesha]

ERPs, ERSPs, ITCs, more:

• Event Related Potential (ERPs) for both within subject and group
• Event Related Spectral Power (ERSPs) for both within subject and group
• Inter trial coherence (ITCs) for both within subject and group