Adding compatiblity for ndx-eventstable

[gviejo]

Compatibility with new NWB object : https://github.com/rly/ndx-events

[codecov]

Codecov Report

❌ Patch coverage is 52.38095% with 20 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pynapple/io/interface_nwb.py	48.71%	14 Missing and 6 partials ⚠️

Files with missing lines	Coverage Δ
pynapple/core/interval_set.py	97.11% <100.00%> (ø)
pynapple/io/__init__.py	100.00% <100.00%> (ø)
pynapple/process/perievent.py	100.00% <100.00%> (ø)
pynapple/io/interface_nwb.py	76.25% <48.71%> (-3.18%)	⬇️

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[gviejo]

We should check if TsdFrame can have mixed type object.