Propagate unit_electrode_indices to SortingInterface

[h-mayorquin]

This will allow the user to pass a mapping between units and the electrodes on the electrode table. Eventually I will use this to add a more robust solution like here:

#1112 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.60%. Comparing base (419ab11) to head (ff41d1c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1124   +/-   ##
=======================================
  Coverage   90.59%   90.60%           
=======================================
  Files         129      129           
  Lines        8187     8193    +6     
=======================================
+ Hits         7417     7423    +6     
  Misses        770      770           

Flag	Coverage Δ
unittests	90.60% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...nterfaces/ecephys/basesortingextractorinterface.py	80.19% <100.00%> (+0.40%)	⬆️
src/neuroconv/nwbconverter.py	94.85% <ø> (ø)
...c/neuroconv/tools/spikeinterface/spikeinterface.py	91.15% <100.00%> (+0.06%)	⬆️