[WIP] Base pymatgen objects, Computed{Structure}Entry pydantic models

[esoteric-ephemera]

• Pydantic models for:
  • ComputedEntry
  • ComputedStructureEntry
  • Energy adjustments field of those entries
  • Generic MSONable
  • Material (equivalent of pymatgen Structure)
  • Molecule

For these more in-depth objects, functionality is there to get critical features from Material without going into the pymatgen object:

• primitive and conventional cells
• volume
• density
• composition

[codecov-commenter]

Codecov Report

❌ Patch coverage is 70.22472% with 159 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.83%. Comparing base (e22dc2b) to head (5f2daa2).

Files with missing lines	Patch %	Lines
emmet-core/emmet/core/atoms/base.py	54.96%	68 Missing ⚠️
emmet-core/emmet/core/atoms/periodic.py	57.40%	46 Missing ⚠️
emmet-core/emmet/core/entry.py	75.90%	20 Missing ⚠️
emmet-core/emmet/core/atoms/elements.py	89.80%	16 Missing ⚠️
emmet-core/emmet/core/types/mson.py	75.00%	4 Missing ⚠️
emmet-core/emmet/core/grain_boundary.py	40.00%	3 Missing ⚠️
emmet-core/emmet/core/surface_properties.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1431      +/-   ##
===========================================
- Coverage    85.32%   84.83%   -0.49%     
===========================================
  Files          230      236       +6     
  Lines        18831    19351     +520     
===========================================
+ Hits         16067    16417     +350     
- Misses        2764     2934     +170     

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