Fix bug in AutoSlots deepcopy

[jsiirola]

Fixes # .

Summary/Motivation:

This resolves an issue where AutoSlots was recording the temporary dict used to hold the class __dict__ in the memo (and then threw away the temporary dict). This was causing the deepcopy to corrupt the model in certain situations (IDAES models - but only on Windows with certain environments).

The fix is to remove the temporary dict from the memo.

This PR also updates the ConfigBase / ConfigDict __getstate__/__setstate__ to avoid creating temporary tuples.

Changes proposed in this PR:

• Do not record the temporary __dict__ dict in the deepcopy memo
• Do not create temporary tuples when serializing ConfigBase / ConfigDict objects

Legal Acknowledgement

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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

All modified and coverable lines are covered by tests ✅

Project coverage is 88.66%. Comparing base (364e7f1) to head (e7bf41c).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3412   +/-   ##
=======================================
  Coverage   88.66%   88.66%           
=======================================
  Files         879      879           
  Lines      100374   100381    +7     
=======================================
+ Hits        88999    89007    +8     
+ Misses      11375    11374    -1     

Flag	Coverage Δ
linux	86.12% <100.00%> (+<0.01%)	⬆️
osx	76.11% <100.00%> (+<0.01%)	⬆️
other	86.61% <100.00%> (+<0.01%)	⬆️
win	84.46% <100.00%> (+<0.01%)	⬆️

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