Add an option to select specific unit_ids or just indexes of neurons #124

for calcium data for mice we have files like mouse_folder/responses/meta/unit_ids.npy and as we might to take certain neurons outside - would be nice to give a parameter to have certain neuron_ids out . ALternatively, we might just leave out some channels by indexes.
The inspiration comes from neuron_ids selection in sensorium 2022 (code link)

The PR should do it both for sequence interpolator and for spike interpolator