Add magnetic_moments field to InputDoc

[mattmcdermott]

Added a magnetic_moments field to the InputDoc class.

This is instantiated from parameters["MAGMOM"].

This is a necessary change to support a common magnetic orderings workflow in atomate2. See discussion in the open PR: materialsproject/atomate2#432

Tagging @utf

Contributor Checklist

• I have run the tests locally and they passed.
• I have added tests, or extended existing tests, to cover any new features or bugs fixed in this PR
  ^ (no tests needed here)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.22%. Comparing base (7735bb1) to head (56250c5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #945   +/-   ##
=======================================
  Coverage   90.22%   90.22%           
=======================================
  Files         138      138           
  Lines       13159    13160    +1     
=======================================
+ Hits        11873    11874    +1     
  Misses       1286     1286           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.