First version of the model group comparator

[kasunamare]

Outputs to generate in the first version

All elements are to be shown with (1) aggregated summary and (2) over time disaggregates

• Metric of interest comparison
• Comparing Precision and Recall curves
• Bias vs model performance
• List overlaps

[kasunamare]

When @silil and I tried to merge these changes, we found that the code now is all over the place and requires organizing. So, extending this issue to include the following:

• base module that includes a Model class and a ModelGroup class that encapsulates the properties
• analyze module that includes a ModelAnalyzer and ModelGroupAnalyzer class that calculates & displays crosstabs, and error analyses for models and model groups
• compare module that consists of a ModelComparison and a ModelGroupComparison class that compares models and groups to one another
• To minimize repeated DB calls at the two levels, we will create a db connection module that can run the appropriate queries at the appropriate levels. This could be aiosql
• plots module that handles all the plotting code

[silil]

postomdeling refactoring and new functionality