Add function to plot a model's incidence graph in Dulmage-Mendelsohn order

[Robbybp]

Summary/Motivation:

Thanks to a casual comment by @jeanpaulwatson, and because I've spent way too many hours reproducing these plots over and over, I'd like to add a method plot a model's incidence matrix in Dulmage-Mendelsohn order.

Changes proposed in this PR:

• spy_dulmage_mendelsohn function that plots incidence matrix on Matplotlib Axes in Dulmage-Mendelsohn order.

I've tried to automatically compute a markersize that seems to work for both small and large-ish systems. For a small model, we get something like:

For a large-ish model, we get something like (with include_wellconstrained=False):

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[Robbybp]

Windows coverage failure appears unrelated.

[mrmundt]

Windows coverage failure appears unrelated.

Coverage failures are, 99.99999% of the time, unrelated. (And also obnoxious.)

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 88.24%. Comparing base (c849905) to head (065b422).
Report is 6 commits behind head on main.

Files	Patch %	Lines
pyomo/contrib/incidence_analysis/visualize.py	90.54%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3207      +/-   ##
==========================================
- Coverage   88.40%   88.24%   -0.16%     
==========================================
  Files         846      847       +1     
  Lines       95156    95402     +246     
==========================================
+ Hits        84118    84189      +71     
- Misses      11038    11213     +175     

Flag	Coverage Δ
linux	86.34% <90.90%> (+<0.01%)	⬆️
osx	76.18% <90.90%> (+0.01%)	⬆️
other	86.53% <90.90%> (-0.01%)	⬇️
win	83.83% <90.90%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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

[blnicho]

I have one minor docstring edit but otherwise this looks good!