Refactor the compartmental model

[billlyzhaoyh]

1. Separate out the three models and bring them under a more consistent object oriented structure
2. Have a new parameter class where methods like read_from_csv, read_from_json, read_from_cache, read_from_db can be added
3. The models can be run with command line (like the console runner to produce the results of the experiments)
4. Maybe leverage a local dask cluster to schedule the model runs and achieve good performance
5. Add a scenario module that computes different combinations of model parameters to explore different scenarios (scenario itself can be a class)