Refactor multilayer drawing function and add headers to convert module

[nwlandry]

This adds the ability for users to specify the colors/sizes of every node/edge in the multilayer drawing function.

[nwlandry]

Happy for any feedback @thomasrobiglio!!

[thomasrobiglio]

@nwlandry let me know if this is still a draft or you want me to review it (it looks like the function is ready we just need to twitch the tests)... I tried it very quickly today and it seems very nice and much more coherent with the rest of the drawing functions of XGI than my initial attempt 😄, thank you!

[nwlandry]

Hi @thomasrobiglio, yes sorry about this - let me draft it and undraft when I am done updating the docs, tests, etc. I had a great foundation to work from, so thanks :)

[codecov]

Codecov Report

Patch coverage: 93.57% and no project coverage change.

Comparison is base (cbaec09) 90.97% compared to head (f9c9cc0) 90.97%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #434   +/-   ##
=======================================
  Coverage   90.97%   90.97%           
=======================================
  Files          58       59    +1     
  Lines        4088     4100   +12     
=======================================
+ Hits         3719     3730   +11     
- Misses        369      370    +1     

Files Changed	Coverage Δ
xgi/convert/bipartite_edges.py	44.44% <ø> (ø)
xgi/convert/bipartite_graph.py	100.00% <ø> (ø)
xgi/convert/graph.py	100.00% <ø> (ø)
xgi/convert/higher_order_network.py	95.19% <ø> (ø)
xgi/convert/hyperedges.py	100.00% <ø> (ø)
xgi/convert/hypergraph_dict.py	95.45% <ø> (ø)
xgi/convert/incidence.py	76.92% <ø> (ø)
xgi/convert/line_graph.py	95.00% <ø> (-5.00%)	⬇️
xgi/convert/pandas.py	100.00% <ø> (ø)
xgi/convert/simplex.py	100.00% <ø> (ø)
... and 5 more

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[thomasrobiglio]

Looks very nice @nwlandry thank you!

I would suggest to rename the PR name in order to mark also the reorganisation of the draw.py module with the creation of draw_utils.py

Random thought: how do we feel allowing also for the personalisation of the planes colors here also?

[nwlandry]

I added a plane_color option with the default as grey. Because I rebased, it looks like I reorganized the drawing module, but that is already on the main branch. Thanks for the review!!