Sensitivity calculation for named expressions

[eslickj]

Fixes None

Summary/Motivation:

This adds sensitivity calculations for named expressions to the pynumero sensitivity calculations in the sensitivity toolbox. Usually, it is probably better to add a variable to the model, but on rare occasions that can cause trouble.

Changes proposed in this PR:

• Add ability to include named expressions in sensitivity matrix

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.

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.19%. Comparing base (de14e28) to head (b1466e4).
⚠️ Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
pyomo/contrib/sensitivity_toolbox/pynumero.py	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3685      +/-   ##
==========================================
- Coverage   89.20%   89.19%   -0.01%     
==========================================
  Files         892      892              
  Lines      102978   102997      +19     
==========================================
+ Hits        91857    91872      +15     
- Misses      11121    11125       +4     

Flag	Coverage Δ
builders	26.73% <9.09%> (-0.01%)	⬇️
default	85.79% <95.45%> (?)
expensive	34.08% <9.09%> (?)
linux	86.97% <95.45%> (-1.99%)	⬇️
linux_other	86.97% <95.45%> (+<0.01%)	⬆️
osx	83.27% <95.45%> (+<0.01%)	⬆️
win	85.15% <95.45%> (-0.01%)	⬇️
win_other	85.15% <95.45%> (-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.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[blnicho]

Two minor comments but otherwise this looks fine.

[blnicho]

Why did you change the dimension of ds/dp in the docstring without changing anything in the implementation? You just made this change (i.e. changing the dimension from ns by np to ns+np by np) in #3655

[eslickj]

This is a mistake. Somehow, I accidently reverted to a older version of the file and things got a little mixed up. I'll fix it.