feat: use DictManager's preimage field to track preimages of hashed keys

[enitrat]

Closes #795

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.60%. Comparing base (5d4d479) to head (d9f54d4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #788   +/-   ##
=======================================
  Coverage   81.60%   81.60%           
=======================================
  Files          56       56           
  Lines       12870    12870           
=======================================
  Hits        10503    10503           
  Misses       2367     2367           

Flag	Coverage Δ
ci	81.60% <ø> (?)

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[Eikix]

tests fail

[enitrat]

tests fail

can't repro locally 🗡️