Pydantic 2 support

[munrojm]

This PR adds support for pydantic 2 update of the MP stack

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (ffd9713) 70.39% compared to head (0401931) 70.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #847      +/-   ##
==========================================
+ Coverage   70.39%   70.42%   +0.02%     
==========================================
  Files          51       51              
  Lines        2483     2482       -1     
==========================================
  Hits         1748     1748              
+ Misses        735      734       -1     

Files	Coverage Δ
mp_api/client/core/client.py	82.87% <100.00%> (ø)
mp_api/client/core/settings.py	92.59% <100.00%> (+0.28%)	⬆️
mp_api/client/mprester.py	65.81% <ø> (ø)
...pi/client/routes/materials/electronic_structure.py	87.78% <100.00%> (ø)
mp_api/client/core/utils.py	62.26% <78.57%> (+0.44%)	⬆️

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