Create API version attribute for different solver generations

[mrmundt]

Fixes N/A (but is a task on #3688)

Summary/Motivation:

We want an easier way for users/devs to query which API version of solvers they are using.

Changes proposed in this PR:

• Create a standard SolverAPIVersion enum
• Add the enum as a classmethod to all solver base classes
• Update some tests

Legal Acknowledgement

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1. I agree my contributions are submitted under the BSD license.
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[jsiirola]

Overall, this will be useful. It just needs some documentation cleanup.

[codecov]

Codecov Report

❌ Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.88%. Comparing base (58b0a43) to head (03d4062).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
pyomo/opt/base/solvers.py	71.42%	2 Missing ⚠️
pyomo/contrib/appsi/base.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3699      +/-   ##
==========================================
- Coverage   89.19%   87.88%   -1.32%     
==========================================
  Files         892      892              
  Lines      103018   103035      +17     
==========================================
- Hits        91892    90556    -1336     
- Misses      11126    12479    +1353     

Flag	Coverage Δ
builders	26.74% <78.94%> (+0.01%)	⬆️
default	85.77% <84.21%> (?)
expensive	34.08% <78.94%> (?)
linux	31.38% <78.94%> (-57.55%)	⬇️
linux_other	31.38% <78.94%> (-55.57%)	⬇️
osx	?
win	?
win_other	?

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[michaelbynum]

I like it!