Extend valid types for PyROS solver argument uncertain_params

[shermanjasonaf]

Summary/Motivation:

Motivated by recent user feedback, this PR adds support for the speciifcation of Var and VarData objects as (entries of) the argument uncertain_params to contrib.pyros.PyROS.solve(). Thus, the argument uncertain_params can now be a Param, ParamData, Var, or VarData instance, or an iterable sequence of such instances.

Note that if uncertain_params is of type Var/VarData, or otherwise has Var or VarData entries, then there may be an appreciable computational overhead during the PyROS solver preprocessing step for models with large numbers of Constraint, Expression, and/or Objective components in which the Var/VarData objects appear.

Changes proposed in this PR:

• Allow PyROS solver to support Var and VarData objects in uncertain_params argument

TODO (after #3434 merged)

• Update version number and changelog
• Add bullet on preprocessing progress logging in logging output explanation table?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.72%. Comparing base (eb8a6b5) to head (c372d98).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3439   +/-   ##
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  Coverage   88.71%   88.72%           
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  Files         882      882           
  Lines      100622   100650   +28     
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+ Hits        89271    89304   +33     
+ Misses      11351    11346    -5     

Flag	Coverage Δ
linux	86.18% <100.00%> (+<0.01%)	⬆️
osx	76.21% <100.00%> (+0.01%)	⬆️
other	86.69% <100.00%> (+0.01%)	⬆️
win	84.66% <100.00%> (+0.01%)	⬆️

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