Implement DC Optional State Supplemental Payment (OSSP)

[mattunrath]

Implements DC OSSP for adult foster care and nursing facility residents. 6 tests passing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (63a7861) to head (00cff8f).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #7730   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         9    +4     
  Lines           69       117   +48     
  Branches         2         0    -2     
=========================================
+ Hits            69       117   +48     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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