Add stimulus templates to behavior NWBs

**Is your feature request related to a problem? Please describe.**
stimulus/behavior NWBs typically include stimulus templates, i.e. arrays corresponding to the stimuli that that were shown in an experiment (e.g. a grating, a natural image, a movie frame). We should add these for the change detection behavior NWBs.

**Describe the solution you'd like**
I think there are stimulus files saved as .npz or similar somewhere on the institute network or possibly in code ocean that can be loaded then added to the NWB files. including the main stimuli is the most important (i.e the images shown in change detection task), the fingerprint movie may be too large to include in each NWB and could instead get its own auxillary NWB (or maybe one already exists since its the same movie shown in visual coding and other experiments).

**Describe alternatives you've considered**
Movie files can be provided in an alternate format, in their own NWB or in some other form. but ultimately users need a way to view the stimuli that are listed in the stimulus tables in the NWB file.

**Additional context**
An example, from a V1 deep dive ophys + behavior NWB file: