SpikeGLX: Add inter-sample shift description and fix ElectrodeGroup naming

[h-mayorquin]

From the IBL project. The inspector run reveals that the description of inter-sample-shift is missing. As we always have this for SpikeGLX it is a good idea to add it.

Plus, the current ElectrodeGroup naming is confusing when some of the probes have shanks. Here, the diff is illustrative:

Version on main:

Note that the shank number is confusing as they are concatenated with the device number of the probe making it hard to read and identify.

Version on this branch:

In this case, the second and third probes have shanks and the ElectrodeGroups indicate the situation more clearly.

[h-mayorquin]

This is to make errors easier to track in the testing suite.

[alejoe91]

@h-mayorquin this looks great! One comment: I think the name should be Neuropixels instead of Neuropixel, since that's the correct probe name (https://www.neuropixels.org/)

[h-mayorquin]

Ah thanks for the naming thing. It was inconsistent between devices and ElectrodeGroups and I opted for the singular. Thanks for the correction.

[h-mayorquin]

@alejoe91 did the name changing: Neuropixel -> Neuropixels.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.12%. Comparing base (96dfdff) to head (c960880).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1177      +/-   ##
==========================================
- Coverage   90.69%   90.12%   -0.58%     
==========================================
  Files         129      129              
  Lines        8189     8300     +111     
==========================================
+ Hits         7427     7480      +53     
- Misses        762      820      +58     

Flag	Coverage Δ
unittests	90.12% <100.00%> (-0.58%)	⬇️

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

Files with missing lines	Coverage Δ
.../datainterfaces/ecephys/spikeglx/spikeglx_utils.py	97.95% <100.00%> (ø)
...terfaces/ecephys/spikeglx/spikeglxdatainterface.py	95.71% <100.00%> (+0.71%)	⬆️

... and 18 files with indirect coverage changes