Unify NP reading with probe part number

[alejoe91]

• Use probe_part_number in OE and imDatPrb_pn in SpikeGLX to correctly read different NP probes
• Add Neuropixels Opto in the npx_probe dictionary (NP1300)
• Add new test file and test for NP2 4 shank (from @JoeZiminski)

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (c5e74d9) 89.24% compared to head (2dcb7a5) 88.90%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #232      +/-   ##
==========================================
- Coverage   89.24%   88.90%   -0.35%     
==========================================
  Files          10       10              
  Lines        1702     1694       -8     
==========================================
- Hits         1519     1506      -13     
- Misses        183      188       +5     

Files	Coverage Δ
src/probeinterface/probe.py	92.87% <100.00%> (ø)
src/probeinterface/io.py	87.16% <91.66%> (-0.85%)	⬇️

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