Move ClassHash into transaction module

[fmoletta]

Closes #1231

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (8f9b552) 88.97% compared to head (fe573d6) 88.97%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1232   +/-   ##
=======================================
  Coverage   88.97%   88.97%           
=======================================
  Files          52       52           
  Lines       15604    15604           
=======================================
  Hits        13884    13884           
  Misses       1720     1720           

Files	Coverage Δ
src/core/errors/state_errors.rs	50.00% <ø> (ø)
src/execution/execution_entry_point.rs	94.77% <ø> (ø)
src/execution/mod.rs	90.87% <ø> (ø)
src/lib.rs	98.23% <ø> (ø)
src/state/cached_state.rs	88.84% <ø> (ø)
src/state/contract_class_cache.rs	55.88% <ø> (ø)
src/state/contract_storage_state.rs	95.83% <ø> (ø)
src/state/in_memory_state_reader.rs	91.72% <ø> (ø)
src/state/mod.rs	95.11% <ø> (ø)
src/state/state_api.rs	100.00% <ø> (ø)
... and 14 more

[pefontana]

LGTM