refactor(verification): move block-only verification methods [part 3/5]

[glevco]

Depends on #797

Motivation

This is the third PR in a 5-part series of PRs that completely move verification-related code out of the vertex model classes.

This PR moves the verification method implementations of the Block inheritance branch.

Acceptance Criteria

• Remove all Block and MergeMinedBlock verification methods from the original model classes, moving the implementation to each respective Verifier class. The only exception is the verify_outputs() method, which is part of the inheritance tree up to BaseTransaction, and will be moved in a separate PR.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3365e4b) 84.52% compared to head (94b9075) 84.62%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
+ Coverage   84.52%   84.62%   +0.09%     
==========================================
  Files         269      269              
  Lines       22308    22296      -12     
  Branches     3401     3401              
==========================================
+ Hits        18856    18868      +12     
+ Misses       2777     2760      -17     
+ Partials      675      668       -7     

Files	Coverage Δ
hathor/transaction/block.py	94.52% <100.00%> (-0.70%)	⬇️
hathor/transaction/merge_mined_block.py	64.86% <ø> (-4.91%)	⬇️
hathor/verification/block_verifier.py	100.00% <100.00%> (+6.45%)	⬆️
hathor/verification/merge_mined_block_verifier.py	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

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The base branch was changed.