Retrieve sentiment score history as a timeseries

[uclatommy]

Users should be able to retrieve historical sentiment scores calculated using any parameterization of the real-time model and observed at any frequency.

[uclatommy]

Because we are chunking the dataframes when we query the data, there are distortions in the calculation where you would get inconsistencies in the sentiment score based on whether or not a group was split across two chunks. For example, due to chunking, the last group in a dataframe has a portion of its data in the next chunk. As a result, this group will be subject to the 0.01 factor in this iteration, while the other portion gets calculated in the next iteration.