More MPRester Updates

[munrojm]

This PR contains additional MPRester updates to methods and tests.

[codecov-commenter]

Codecov Report

Merging #312 (ca54702) into main (0a0c416) will increase coverage by 9.03%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
+ Coverage   80.00%   89.03%   +9.03%     
==========================================
  Files          59       58       -1     
  Lines        1970     1906      -64     
==========================================
+ Hits         1576     1697     +121     
+ Misses        394      209     -185     

Impacted Files	Coverage Δ
src/mp_api/__init__.py	100.00% <ø> (+43.47%)	⬆️
src/mp_api/core/client.py	91.86% <ø> (+6.88%)	⬆️
src/mp_api/routes/electronic_structure/client.py	87.73% <ø> (+29.55%)	⬆️
src/mp_api/routes/piezo/client.py	89.47% <ø> (+7.65%)	⬆️
src/mp_api/routes/search/client.py	95.34% <ø> (+65.11%)	⬆️
src/mp_api/routes/xas/client.py	80.95% <ø> (+25.07%)	⬆️
src/mp_api/routes/robocrys/client.py	92.30% <66.66%> (+19.58%)	⬆️
src/mp_api/routes/synthesis/client.py	91.66% <66.66%> (+21.66%)	⬆️
src/mp_api/matproj.py	93.70% <100.00%> (+12.78%)	⬆️
... and 8 more

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