[Depends on #3703] Direct and Persistent Interfaces to SCIP

[michaelbynum]

Fixes #849 .

Summary/Motivation:

The primary purpose of the PR is to port the direct and persistent interfaces for SCIP from #3200 to contrib/solver. I worked off of the branch created by @Opt-Mucca, so all of their commits are preserved. I will close #3200 shortly.

Changes proposed in this PR:

• Create direct and persistent interfaces to SCIP
• Expand the API of the ModelChangeDetector in contrib/observer slightly

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 79.12850% with 752 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.66%. Comparing base (7deb912) to head (b037b9c).
⚠️ Report is 392 commits behind head on main.

Files with missing lines	Patch %	Lines
pyomo/contrib/solver/solvers/scip/scip_direct.py	29.17%	483 Missing ⚠️
...contrib/solver/solvers/gurobi/gurobi_persistent.py	89.20%	88 Missing ⚠️
pyomo/contrib/observer/model_observer.py	92.66%	43 Missing ⚠️
...omo/contrib/doe/examples/rooney_biegler_example.py	21.05%	30 Missing ⚠️
pyomo/contrib/parmest/parmest.py	91.48%	23 Missing ⚠️
pyomo/contrib/solver/common/solution_loader.py	69.86%	22 Missing ⚠️
...ontrib/solver/solvers/gurobi/gurobi_direct_base.py	89.51%	15 Missing ⚠️
pyomo/contrib/viewer/qt.py	0.00%	9 Missing ⚠️
...omo/contrib/solver/solvers/gurobi/gurobi_direct.py	93.54%	8 Missing ⚠️
pyomo/contrib/solver/solvers/sol_reader.py	63.15%	7 Missing ⚠️
... and 10 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3744      +/-   ##
==========================================
- Coverage   89.19%   85.66%   -3.54%     
==========================================
  Files         892      900       +8     
  Lines      103100   105231    +2131     
==========================================
- Hits        91956    90141    -1815     
- Misses      11144    15090    +3946     

Flag	Coverage Δ
builders	?
default	85.58% <79.12%> (?)
expensive	35.72% <35.47%> (?)
linux	?
linux_other	?
osx	?
win	?
win_other	?

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