Allow plot_probe not to plot on axes, but just return polycollections

[jakeswann1]

Retains previous default behaviour, but adds the option not to plot the collections on an axis, but just to return them. This is useful for incorporating the probe layout into other plots (such as SpikeInterface widgets).

[samuelgarcia]

Hi Jake.
I understand the need but I find the design a bit complicated and the option not super intuitive.
Why not having a clear separated function that create the poly that would used internaly by plot_probe and also by you specific need ?
Maybe it is more changes, I don't known. I will try to have a deeper look

[jakeswann1]

Hi Sam, thanks! That makes a lot of sense, I'll work on a refactor

[jakeswann1]

Hi @samuelgarcia, I think this is ready for review - split into a new function as suggested

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.68%. Comparing base (35d2b19) to head (4604a7e).
⚠️ Report is 79 commits behind head on main.

Files with missing lines	Patch %	Lines
src/probeinterface/plotting.py	85.71%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #334      +/-   ##
==========================================
+ Coverage   89.66%   89.68%   +0.02%     
==========================================
  Files          12       12              
  Lines        1954     1959       +5     
==========================================
+ Hits         1752     1757       +5     
  Misses        202      202              

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