add a missing composition builder

[yang-ruoxi]

Contributor Checklist

• I have broken down my PR scope into the following TODO tasks
  • Add a Matscholar builder
  • It pulls from the phase diagram store and the MPContribs store to form a new Missing Composition collection
  • The Missing Composition collection has a very simple document model: e.g.
    "chemical_system": "O-Si", "missing_compositions": [ {"SiO100": {"link": xxx, "DOI": yyy} , {"Si100O": {"link": xxx, "DOI": yyy} ]
• I have tested run the builder locally, serially and generated a store that has correct data
• Test has been added.
  Note :

• According to @computron the text mining project has discontinued, so I presume the MPContribs data will not be updated. However, the missing compositions store will be updated because we will likely run those compositions in the future. To this regard, I would imagine this builder needs to be run in sync with the Phase Diagram builder.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.50% 🎉

Comparison is base (900e3f2) 90.95% compared to head (91629e9) 91.46%.
Report is 54 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #816      +/-   ##
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+ Coverage   90.95%   91.46%   +0.50%     
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  Files         137      136       -1     
  Lines       11725    12609     +884     
==========================================
+ Hits        10665    11533     +868     
- Misses       1060     1076      +16     

see 16 files with indirect coverage changes

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