Deprecate EventWaveform class

[rly]

Motivation

Corresponds to NeurodataWithoutBorders/nwb-schema#584

• Waiting on test suite to pass
• Waiting on schema changes to merge to dev

How to test the behavior?

EventWaveform()  # should return a ValueError

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 ruff check . && codespell 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: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.28%. Comparing base (dc98e84) to head (92643d4).

Files with missing lines	Patch %	Lines
src/pynwb/ecephys.py	66.66%	0 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (dc98e84) and HEAD (92643d4). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (dc98e84)	HEAD (92643d4)
integration	4	0

Additional details and impacted files

@@                 Coverage Diff                  @@
##           nwb_schema_2.8.0    #1940      +/-   ##
====================================================
- Coverage             91.85%   83.28%   -8.58%     
====================================================
  Files                    27       27              
  Lines                  2689     2692       +3     
  Branches                701      702       +1     
====================================================
- Hits                   2470     2242     -228     
- Misses                  145      352     +207     
- Partials                 74       98      +24     

Flag	Coverage Δ
integration	?
unit	83.28% <66.66%> (-0.02%)	⬇️

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