Support more stimulus types

[rly]

Motivation

PR to support schema changes in NeurodataWithoutBorders/nwb-schema#559

How to test the behavior?

python test.py

Checklist

• Did you update CHANGELOG.md with your changes?
• Have you checked our Contributing document?
• Have you ensured the PR clearly describes the problem and the solution?
• Is your contribution compliant with our coding style? This can be checked running flake8 from the source directory.
• Have you checked to ensure that there aren't other open Pull Requests for the same change?
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (40e760c) 92.02% compared to head (32a61ff) 92.01%.

Files	Patch %	Lines
src/pynwb/file.py	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##           nwb-schema-2.7.0    #1842      +/-   ##
====================================================
- Coverage             92.02%   92.01%   -0.02%     
====================================================
  Files                    27       27              
  Lines                  2633     2641       +8     
  Branches                690      693       +3     
====================================================
+ Hits                   2423     2430       +7     
  Misses                  138      138              
- Partials                 72       73       +1     

Flag	Coverage Δ
integration	70.73% <53.84%> (-0.14%)	⬇️
unit	83.75% <92.30%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[CodyCBakerPhD]

Tests look good to me; I'll follow up with any issues when I reconvert the visual coding dataset