refactor(transactions): move TransactionValidator to forger

[sebastijankuzner]

Summary

Checklist

• Ready to be merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.36%. Comparing base (aa8632b) to head (435ccbd).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1307      +/-   ##
===========================================
+ Coverage    56.06%   56.36%   +0.30%     
===========================================
  Files          966      969       +3     
  Lines        64240    64614     +374     
  Branches      1571     1653      +82     
===========================================
+ Hits         36016    36421     +405     
+ Misses       27993    27962      -31     
  Partials       231      231              

Flag	Coverage Δ
contracts	97.74% <ø> (?)
packages	56.08% <ø> (+0.01%)	⬆️

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