[Maikol]

Adds the design for removing packages/contracts and packages/contracts-test by moving each live contract to the package that owns it, and the implementation plan for each phase of that work. Plans are added here as each phase starts, so this PR is the single place for the docs; it has no code changes and is not meant to be merged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.47%. Comparing base (3c7ca93) to head (823a105).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #1372    +/-   ##
========================================
  Coverage   91.47%   91.47%            
========================================
  Files          81       81            
  Lines        5326     5326            
  Branches      973     1132   +159     
========================================
  Hits         4872     4872            
  Misses        433      433            
  Partials       21       21            

Flag	Coverage Δ
unittests	91.47% <ø> (ø)

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