Builder bug fixes

[munrojm]

This PR contains some small builder bug fixes:

• equilibrium_reaction_energy_per_atom typo fix in summary
• Ensure composition serializes to dict in provenance builder
• Ensure +U values are validated for all calculations in validation builder
• Ensure chemsys processing list is sorted in thermo builder

[codecov-commenter]

Codecov Report

Merging #272 (24b9379) into main (9246202) will decrease coverage by 0.00%.
The diff coverage is 86.66%.

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
- Coverage   91.77%   91.77%   -0.01%     
==========================================
  Files          42       42              
  Lines        2871     2870       -1     
==========================================
- Hits         2635     2634       -1     
  Misses        236      236              

Impacted Files	Coverage Δ
emmet-core/emmet/core/summary.py	88.28% <ø> (ø)
emmet-builders/emmet/builders/vasp/materials.py	81.14% <66.66%> (ø)
emmet-core/emmet/core/provenance.py	94.31% <100.00%> (ø)
emmet-core/emmet/core/vasp/validation.py	85.88% <100.00%> (-0.17%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a9c8ae3...24b9379. Read the comment docs.