Add support for NWB schemas v2.8.0

[ehennestad]

Fix #628

Motivation

Add support for NWB schema v2.8.0

How to test the behavior?

Show here how to reproduce the new behavior (can be a bug fix or a new feature)

Todo

• Add more detailed example for device in ecephys and ophys tutorials

Checklist

• Have you ensured the PR description clearly describes the problem and solutions?
• Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[rly]

Thanks @ehennestad . We just released NWB schema 2.8.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.17%. Comparing base (e070e20) to head (205083a).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #630      +/-   ##
==========================================
+ Coverage   95.16%   95.17%   +0.01%     
==========================================
  Files         113      113              
  Lines        4734     4750      +16     
==========================================
+ Hits         4505     4521      +16     
  Misses        229      229              

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