[Depends on #3821 and #3744] Initialization Module

[michaelbynum]

Summary/Motivation:

This PR adds a module to devel called initialization. The goal of the module is to provide methods to help initialize nonconvex nonlinear programming problems.

Changes proposed in this PR:

• Add initialization module
• Add an initialization method that uses a global optimization solver to find a feasible solution
• Add an initialization method that builds a linear programming approximation using linear least squares
• Add an initialization method that builds a piecewise linear approximation and iteratively refines it

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 64.00911% with 632 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.07%. Comparing base (43a6446) to head (2030f4e).

Files with missing lines	Patch %	Lines
pyomo/contrib/solver/solvers/scip/scip_direct.py	29.87%	493 Missing ⚠️
pyomo/devel/initialization/pwl_init.py	87.26%	27 Missing ⚠️
pyomo/contrib/piecewise/transform/factorable.py	92.56%	24 Missing ⚠️
pyomo/devel/initialization/initialize.py	72.13%	17 Missing ⚠️
pyomo/contrib/solver/common/solution_loader.py	78.08%	16 Missing ⚠️
...ontrib/solver/solvers/gurobi/gurobi_direct_base.py	65.78%	13 Missing ⚠️
...evel/initialization/examples/init_polynomial_ex.py	31.57%	13 Missing ⚠️
pyomo/devel/initialization/global_init.py	52.38%	10 Missing ⚠️
pyomo/devel/initialization/lp_approx_init.py	95.96%	5 Missing ⚠️
...omo/devel/initialization/bounds/bound_variables.py	73.33%	4 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3912      +/-   ##
==========================================
- Coverage   89.94%   88.07%   -1.87%     
==========================================
  Files         902      912      +10     
  Lines      106457   108146    +1689     
==========================================
- Hits        95748    95245     -503     
- Misses      10709    12901    +2192     

Flag	Coverage Δ
builders	29.11% <25.56%> (-0.07%)	⬇️
default	85.87% <63.83%> (?)
expensive	35.46% <25.56%> (?)
linux	34.55% <26.13%> (-54.88%)	⬇️
linux_other	34.55% <26.13%> (-52.85%)	⬇️
oldsolvers	28.06% <25.56%> (-0.06%)	⬇️
osx	?
win	?
win_other	?

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