Add binary to dump explicit colored graphs

[daemontus]

For some small experiments, it is useful to have a binary that explicitly prints the semantic graph of the PBN.

This PR:

• Adds dump_graph.rs binary which prints the graph as simple text.
• Adds some small .aeon models which the user can verify the functionality on.
• Adds explanation to README how to use the dump-graph binary.

[codecov[bot]]

Codecov Report

Merging #8 into master will decrease coverage by 0.65%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
- Coverage   85.00%   84.35%   -0.66%     
==========================================
  Files          28       30       +2     
  Lines        1761     2045     +284     
==========================================
+ Hits         1497     1725     +228     
- Misses        264      320      +56     

Impacted Files	Coverage Δ
src/bin/dump_graph.rs	0.00% <0.00%> (ø)
src/impl_fn_update.rs	87.50% <0.00%> (-6.25%)	:arrow_down:
src/impl_regulatory_graph.rs	84.90% <0.00%> (-1.89%)	:arrow_down:
src/bdd_params/impl_witness_generator.rs	81.08% <0.00%> (-1.81%)	:arrow_down:
src/bdd_params/impl_bdd_parameter_encoder.rs	85.45% <0.00%> (-0.61%)	:arrow_down:
src/display_regulatory_graph.rs	95.00% <0.00%> (-0.46%)	:arrow_down:
src/sbml/export.rs	94.78% <0.00%> (-0.26%)	:arrow_down:
src/async_graph/impl_async_graph.rs	88.00% <0.00%> (-0.24%)	:arrow_down:
src/parser/impl_regulatory_graph.rs	98.68% <0.00%> (-0.13%)	:arrow_down:
src/bdd_params/impl_static_constraints.rs	98.78% <0.00%> (-0.08%)	:arrow_down:
... and 6 more

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