Refactor VASP and QChem Enums

[esoteric-ephemera]

Changes how VASP and QChem enums are generated:

• generate.py scripts replaced by a central dev_scripts/generate_enums.py file
• Standardize yaml config file names as calc_types.yaml
• Added basic enum tests

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.84615% with 4 lines in your changes missing coverage. Please review.

Project coverage is 87.51%. Comparing base (a6c86e0) to head (ea650c7).

Files with missing lines	Patch %	Lines
emmet-core/emmet/core/qchem/calc_types/__init__.py	0.00%	2 Missing ⚠️
emmet-core/emmet/core/vasp/calc_types/__init__.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1098      +/-   ##
==========================================
- Coverage   90.18%   87.51%   -2.68%     
==========================================
  Files         147      149       +2     
  Lines       14174    11150    -3024     
==========================================
- Hits        12783     9758    -3025     
- Misses       1391     1392       +1     

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[tsmathis]

closing in favor of #1095