Compatibility with emmet-core 0.86.0rc1

[esoteric-ephemera]

Changes related to serialization behavior changes that started in emmet-core==0.86.0rc0, ensuring compatibility with emmet-core==0.86.0rc1 here.

Summary:

• Ensure structures are returned as objects in materials endpoint. This was probably previously an issue with monty_decode=False too
• Allow dict-like key access of MPDataDoc objects, + add a .get method. Reduces use_document_model boilerplate and permits pandas-like parity between dot-notation and key-item access

[codecov-commenter]

Codecov Report

❌ Patch coverage is 74.13793% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.85%. Comparing base (254c7d0) to head (089c157).

Files with missing lines	Patch %	Lines
mp_api/client/mprester.py	76.19%	5 Missing ⚠️
mp_api/client/core/client.py	76.92%	3 Missing ⚠️
mp_api/client/routes/materials/materials.py	57.14%	3 Missing ⚠️
...pi/client/routes/materials/electronic_structure.py	86.66%	2 Missing ⚠️
mp_api/client/routes/molecules/molecules.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1021      +/-   ##
==========================================
+ Coverage   66.72%   66.85%   +0.13%     
==========================================
  Files          50       50              
  Lines        2777     2767      -10     
==========================================
- Hits         1853     1850       -3     
+ Misses        924      917       -7     

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[esoteric-ephemera]

@tschaume ready for review whenever you get a chance!

[tschaume]

So much cleaner! Thank you. Just a couple of minor questions.