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

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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%)	⬇️

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