Add SCF dataset processing

[eqberkovich]

Added code to download and process SCF data (from Fed).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.17%. Comparing base (fd55081) to head (a922d42). Report is 37 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4257      +/-   ##
==========================================
+ Coverage   99.15%   99.17%   +0.01%     
==========================================
  Files        2403     2412       +9     
  Lines       34800    34852      +52     
  Branches      164      163       -1     
==========================================
+ Hits        34507    34563      +56     
+ Misses        261      259       -2     
+ Partials       32       30       -2     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.