chore: move tree creation logic from source tree to target tree traits

[dorimedini-starkware]

This change is 

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.68750% with 26 lines in your changes are missing coverage. Please review.

Project coverage is 76.91%. Comparing base (1530f51) to head (e57c9df).
Report is 7 commits behind head on main.

Files	Patch %	Lines
...itter/src/patricia_merkle_tree/filled_tree/tree.rs	82.50%	9 Missing and 12 partials ⚠️
...patricia_merkle_tree/updated_skeleton_tree/tree.rs	37.50%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   75.81%   76.91%   +1.09%     
==========================================
  Files          26       26              
  Lines         947      966      +19     
  Branches      947      966      +19     
==========================================
+ Hits          718      743      +25     
+ Misses        195      189       -6     
  Partials       34       34              

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