openbraininstitute / neurodamus / 26640253248

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Combine multiple extracellular electric field stimulus blocks (#532)

## Context
Part 2 for
https://github.com/openbraininstitute/prod-circuit-simulation/issues/172,
combine multiple SpatiallyUniformEField stimulus blocks amd add electric
fields into the EFieldIntegrator mechanism.

## Scope
1. In `stimuli.py`, each cell has an object `ElectrodeSource` which
contains a list of EFields which are parsed per SpatiallyUniformEField
stimulus.
2. In case of mulitple SpatiallyUniformEField stimulus blocks, for every
overlapping cell, its `ElectrodeSource` 's efields list is extended with
the efields from the new block thanks to the singleton design pattern.
3. After looping over the stimulus blocks, call each cell's
`ElectrodeSource.apply_segment_potentialsply` that creates a
`EFieldIntegrator` mod object with the list of EFields
4. Refactor `efield_integrator.mod` to take a list of e-fields, and loop
over the e-fields during `BEFORE BREAKPOINT` process.

## Testing
1. Include `tests/unit/test_multiple_extracellular_stimuli.py`
2. Refactor and compute references for tests regarding extracellular
stimulus, fixes #523

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Co-authored-by: Alessandro Cattabiani <cattabiani@users.noreply.github.com>

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