[Bug]: add_data_interface fails silently on pynwb 3.0

[h-mayorquin]

What happened?

It seems that now in pynwb 3.0 the method add_data_interface was replaced by add.
But the method add_data_interface does not add the structure or throws an error.

Steps to Reproduce

from pynwb.testing.mock.file import mock_NWBFile
from pynwb.testing.mock.ecephys import mock_ElectricalSeries


nwbfile = mock_NWBFile()

# Create processing modules
ecephys_module = nwbfile.create_processing_module('ecephys', 'Example ecephys data')

electrical_series = mock_ElectricalSeries()
ecephys_module.add_data_interface(electrical_series)

assert len(nwbfile.processing["ecephys"].data_interfaces) == 1

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