Change trait to take self by value

[michaelsproul]

Spicy breaking change WIP

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 9 lines in your changes missing coverage. Please review.

Project coverage is 82.51%. Comparing base (12d828c) to head (479e6d0).

Files with missing lines	Patch %	Lines
tree_hash/src/impls.rs	65.38%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
+ Coverage   79.66%   82.51%   +2.85%     
==========================================
  Files           6        6              
  Lines         295      286       -9     
==========================================
+ Hits          235      236       +1     
+ Misses         60       50      -10     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.