feat: allow users to make predictions on their own data with trained model

[adiraju13]

OPEN ISSUES STILL:

1. Dropped streaming = True in into_data_frame()
2. Model trained does not include features computed for data in the test.csv file
3. Right now the assumption is that a user provides all known columns in one file. If they do it across files it won't work.

Marked all of these as TODOs. #2 is highest priority.