Low-lift QA checks for temporal consistency

[ejm714]

One of the things we know NOAA will do is some spot checks, e.g. looking at imagery and seeing if predictions align and looking at temporal consistency.

As a first pass, let's look at temporal consistency.

• for some points in the test set, add additional rows for nearby dates (e.g. a 4 week window)
• generate predictions
• plot trends over time for predictions to see how similar they are
• bonus: look at imagery for these predictions

needs #54