Fix RoiResponseSeries dim warning and clarify other dim warnings

[rly]

Motivation

Fix #1490.

Also add the object class and name that generated the warning to the warning message. This is especially useful when the warning occurs on read of a file, and it is not clear which of many TimeSeries objects the warning comes from.

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

Merging #1491 (883c2f6) into dev (18d4cad) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev    #1491   +/-   ##
=======================================
  Coverage   78.42%   78.42%           
=======================================
  Files          37       37           
  Lines        2777     2777           
  Branches      493      493           
=======================================
  Hits         2178     2178           
  Misses        518      518           
  Partials       81       81           

Impacted Files	Coverage Δ
src/pynwb/image.py	87.37% <ø> (ø)
src/pynwb/base.py	100.00% <100.00%> (ø)
src/pynwb/ecephys.py	96.39% <100.00%> (ø)
src/pynwb/ophys.py	94.20% <100.00%> (ø)

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[bendichter]

thanks for catching this!