WIP: Update Sundials

[white238]

• Updates SUNDIALS past 7.0
• Calls new MFEM Sundials Finalize to avoid calling MPI after our MPI_Finalize due to previous RAII static destructor logic

This cannot be merged until mfem/mfem#5073 goes into MFEM. Thanks @balos1 !

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.03%. Comparing base (db9409c) to head (c5366c9).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1482   +/-   ##
========================================
  Coverage    92.03%   92.03%           
========================================
  Files          199      200    +1     
  Lines        25212    25221    +9     
========================================
+ Hits         23203    23212    +9     
  Misses        2009     2009           

Flag	Coverage Δ
unittests	92.03% <100.00%> (+<0.01%)	⬆️

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[white238]

I'll clean this up after the other PR merges and i update MFEM with Cody's fix. Ignore for now.