Add config option to sort query op

[munrojm]

Summary

Adds additional configuration options to the SortQuery query operator including limiting sortable fields and their total number.

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 81.26%. Comparing base (bb6868e) to head (45d5ad3).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/maggma/api/query_operator/sorting.py	76.92%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #944      +/-   ##
==========================================
- Coverage   81.28%   81.26%   -0.03%     
==========================================
  Files          46       46              
  Lines        3955     3966      +11     
==========================================
+ Hits         3215     3223       +8     
- Misses        740      743       +3     

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