Add colorbars for plot2D

[thomasdorch]

This PR:

• Adds colorbars for plot2D (both in plot_epsilon and plot_fields) (add epsilon colorbar for plot2D #2286)
• Adds additional field components (and derived components) to plot_fields (Add Poynting components to plot_fields #2267)

I think there's more room to improve the look of the colorbars, so let me know if I should make any adjustments!

So far fields look like this:

and epsilon looks like this:

@smartalecH
@joamatab
@SkandanC

[oskooi]

LGTM.

[oskooi]

You should also add this new feature to the plot2D docstrings in simulation.py so that it is documented in the user manual.

[smartalecH]

Why not pass the default plotting options used in plot2D?

[thomasdorch]

Thanks for the feedback!

I think it's in much better shape now that I've:

• updated the docs in simulation.py @oskooi
• added new argument, colorbar_parameters, that let the user specify parameters for the colorbar (including label) and pass them into plot2d @smartalecH

Let me know what you think.

[smartalecH]

LGTM!

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 53.96825% with 29 lines in your changes missing coverage. Please review.

Project coverage is 73.06%. Comparing base (5fa12b4) to head (7a87c62).
Report is 187 commits behind head on master.

Files with missing lines	Patch %	Lines
python/visualization.py	53.22%	29 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2289      +/-   ##
==========================================
- Coverage   73.23%   73.06%   -0.17%     
==========================================
  Files          17       17              
  Lines        4931     4952      +21     
==========================================
+ Hits         3611     3618       +7     
- Misses       1320     1334      +14     

Files with missing lines	Coverage Δ
python/simulation.py	76.86% <100.00%> (+<0.01%)	⬆️
python/visualization.py	41.08% <53.22%> (-0.38%)	⬇️