Enable offset, conversion and channel conversion in mock_ElectricalSeries

[h-mayorquin]

Motivation

I use this functions often for quick tests and and I am interested in having in testing scenarios that involve those attributes. Currently, they are not available so the goal of this PR is to enable them. Note those arguments are enabled in mock_TimeSeries as well so this makes the signatures more consistent.

https://github.com/h-mayorquin/pynwb/blob/8c4d62cc9c67645b04a2633b14148bcbbe2a8c45/src/pynwb/testing/mock/base.py#L10-L27

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

All modified and coverable lines are covered by tests ✅

Comparison is base (87a7c57) 91.97% compared to head (056f5fd) 91.97%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1796   +/-   ##
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  Coverage   91.97%   91.97%           
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  Files          27       27           
  Lines        2617     2617           
  Branches      683      683           
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  Hits         2407     2407           
  Misses        138      138           
  Partials       72       72           

Flag	Coverage Δ
integration	71.22% <ø> (ø)
unit	83.64% <ø> (ø)

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[rly]

Good idea. Please fix the flake8 error and add a changelog.

[h-mayorquin]

@rly done.