Add edges vs nodes plotting, improve plotting in general

[smoia]

Proposed Changes

• Add connectome-like plot (viz.plot_edges).

Change Type

• bugfix (+0.0.1)
• minor (+0.1.0)
• major (+1.0.0)
• refactoring (no version update)
• test (no version update)
• infrastructure (no version update)
• documentation (no version update)
• other

Checklist before review

• I added everything I wanted to add to this PR.
• [Code or tests only] I wrote/updated the necessary docstrings.
• [Code or tests only] I ran and passed tests locally.
• [Documentation only] I built the docs locally.
• My contribution is harmonious with the rest of the code: I'm not introducing repetitions.
• My code respects the adopted style, especially linting conventions.
• The title of this PR is explanatory on its own, enough to be understood as part of a changelog.
• I added or indicated the right labels.

• I added information regarding the timeline of completion for this PR.

• Please, comment on my PR while it's a draft and give me feedback on the development!

[codecov]

Codecov Report

Merging #35 (ac9d639) into master (96f0035) will decrease coverage by 0.00%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
- Coverage   90.63%   90.63%   -0.01%     
==========================================
  Files          14       14              
  Lines        1079     1132      +53     
==========================================
+ Hits          978     1026      +48     
- Misses        101      106       +5     

Impacted Files	Coverage Δ
nigsp/operations/timeseries.py	91.00% <71.42%> (-1.48%)	⬇️
nigsp/viz.py	97.54% <94.64%> (-2.46%)	⬇️
nigsp/workflow.py	73.73% <100.00%> (ø)

[smoia]

🚀 PR was released in 0.11.0 🚀