Move example graphs into package

[bentaculum]

Moves the three example graphs arlo_graph, toy_graph and toy_hypergraph into motile.data, similar to e.g. skimage.data. It seems useful to have a one-liner to get some small TrackGraph when prototyping in motile.

Creating and plotting a graph now works as follows:

from motile import data, plot
graph = data.arlo_graph()
plot.draw_track_graph(graph)

Graphs specific to a certain test can live directly in that test module.

[codecov-commenter]

Codecov Report

Merging #39 (2fbc861) into main (8defb53) will increase coverage by 0.98%. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
+ Coverage   77.12%   78.11%   +0.98%     
==========================================
  Files          28       29       +1     
  Lines         752      786      +34     
==========================================
+ Hits          580      614      +34     
  Misses        172      172              

Impacted Files	Coverage Δ
motile/__init__.py	100.00% <100.00%> (ø)
motile/data.py	100.00% <100.00%> (ø)

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