Header dictionary pass through and BaseRester nesting fix

[munrojm]

• Header dict pass through added to MPRester and BaseRester.
• BaseRester not imports MaterialsRester for document ID checks instead of MPRester.

[codecov-commenter]

Codecov Report

Base: 81.01% // Head: 80.94% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (4d5fbf8) compared to base (49fc74a).
Patch coverage: 89.47% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #715      +/-   ##
==========================================
- Coverage   81.01%   80.94%   -0.08%     
==========================================
  Files          36       36              
  Lines        1754     1758       +4     
==========================================
+ Hits         1421     1423       +2     
- Misses        333      335       +2     

Impacted Files	Coverage Δ
mp_api/client/core/client.py	89.18% <88.57%> (+0.08%)	⬆️
mp_api/client/mprester.py	58.64% <100.00%> (-0.43%)	⬇️

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