Add PySMO's confidence interval function to new surrogate interface

[OOAmusat]

Summary/Motivation:

This PR adds a wrapper for PySMO's confint_regression method, allowing users to calculate confidence intervals for polynomial regression models using the new surrogate interface.

Changes proposed in this PR:

• Wrapper for PySMO's confint_regression method
• Tests for the wrapper
• Documentation for the wrapper

Legal Acknowledgement

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[codecov]

Codecov Report

Base: 70.13% // Head: 70.16% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (58c0baa) compared to base (e83e159).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1005      +/-   ##
==========================================
+ Coverage   70.13%   70.16%   +0.02%     
==========================================
  Files         398      398              
  Lines       64951    64956       +5     
  Branches    12020    12021       +1     
==========================================
+ Hits        45555    45576      +21     
+ Misses      17070    17054      -16     
  Partials     2326     2326              

Impacted Files	Coverage Δ
idaes/core/surrogate/pysmo_surrogate.py	91.77% <100.00%> (+0.13%)	⬆️
idaes/ver.py	61.53% <0.00%> (-4.62%)	⬇️
...daes/core/surrogate/pysmo/polynomial_regression.py	86.09% <0.00%> (+3.14%)	⬆️

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[bpaul4]

I have a couple comments about the changes here.

It would also be good for us to add support for plotting PySMO (and ALAMO) confidence intervals on 2D scatter and parity plots in a future PR for the visualization tools.

[bpaul4]

Looks good! Thanks for adding this, @OOAmusat.

[dangunter]

Left some comments on documentation and code style

[dangunter]

More doc comments

[dangunter]

lgtm