Add Rewards Behavior to stim epochs based on Saskia's Feedback

Saskia mentioned the following changes should be done to the ophys stim tables (and these would also apply to behavior ephys ones?)

1. the behavior and natural movie epochs need some stimulus parameters. For instance, the template for the movie .The name of the image set used for the behavior, and the template of the image set.
2. the reward consumed and trials performed should be in the behavior epoch.
3. The total reward consumed and the reward delivery need to be specified

We should add the reward info to the stim table in order to add distribution info the jsons and NWB files