Add MessageFormat class to InitProblemClasses

[jtduffy]

Resolves #1760

Load MessageFormat class early to prevent ClassCircularityError exceptions.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.83%. Comparing base (ae03a7c) to head (c0f1fbe).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1763      +/-   ##
============================================
+ Coverage     70.82%   70.83%   +0.01%     
- Complexity     9929     9933       +4     
============================================
  Files           825      825              
  Lines         39823    39823              
  Branches       6035     6035              
============================================
+ Hits          28203    28208       +5     
+ Misses         8891     8888       -3     
+ Partials       2729     2727       -2     

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