[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 66.82809% with 137 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.93%. Comparing base (0ac0b62) to head (831f3dd).

Files with missing lines	Patch %	Lines
emmet-core/emmet/core/atoms/base.py	49.29%	72 Missing ⚠️
emmet-core/emmet/core/atoms/periodic.py	58.49%	44 Missing ⚠️
emmet-core/emmet/core/atoms/elements.py	88.46%	18 Missing ⚠️
emmet-core/emmet/core/grain_boundary.py	40.00%	3 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (0ac0b62) and HEAD (831f3dd). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (0ac0b62)	HEAD (831f3dd)
	15	12

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1431       +/-   ##
============================================
- Coverage    85.40%   72.93%   -12.47%     
============================================
  Files          230      156       -74     
  Lines        18667    13379     -5288     
============================================
- Hits         15942     9758     -6184     
- Misses        2725     3621      +896     

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