Add check for duration of time columns in DynamicTable

[bendichter]

#627

[codecov-commenter]

Codecov Report

❌ Patch coverage is 71.42857% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.51%. Comparing base (8a777a1) to head (90de1a9).

Files with missing lines	Patch %	Lines
src/nwbinspector/checks/_tables.py	71.42%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #628      +/-   ##
==========================================
+ Coverage   73.03%   76.51%   +3.47%     
==========================================
  Files          47       47              
  Lines        1587     1622      +35     
==========================================
+ Hits         1159     1241      +82     
+ Misses        428      381      -47     

Files with missing lines	Coverage Δ
src/nwbinspector/checks/__init__.py	100.00% <ø> (ø)
src/nwbinspector/checks/_tables.py	91.55% <71.42%> (-5.93%)	⬇️

... and 4 files with indirect coverage changes

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