Add max chemsys option to thermo

[munrojm]

Add option to only produce ThermoDoc objects for materials which match the largest chemical system in the list of entries provided. This allows for the thermo builder to be order agnostic with respect to the chemical system order. In turn, it can be distributed more efficiently.

[codecov-commenter]

Codecov Report

Base: 92.74% // Head: 92.74% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (fb613f8) compared to base (a07bda7).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #640      +/-   ##
==========================================
- Coverage   92.74%   92.74%   -0.01%     
==========================================
  Files         134      134              
  Lines       24785    24790       +5     
==========================================
+ Hits        22987    22991       +4     
- Misses       1798     1799       +1     

Impacted Files	Coverage Δ
...ders/emmet/builders/materials/corrected_entries.py	84.55% <0.00%> (ø)
emmet-core/emmet/core/thermo.py	96.70% <66.66%> (-1.03%)	⬇️
emmet-builders/emmet/builders/materials/thermo.py	89.34% <100.00%> (+0.17%)	⬆️

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