refactor(verification): implement verify_minted_tokens [part 3/9]

[glevco]

Depends on #858

Motivation

Simplify TokenCreationTransaction verification to remove any calls to super(), as it's not necessary.

Acceptance Criteria

• Remove the TokenCreationVerifier.verify_sum() override, moving its only custom check to a new verify_minted_tokens(), which is now explicitly called in the verify() override.
• Add verify_minted_tokens() to test_verification.
• No behavior should be changed by this 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 (aa5109f) 85.30% compared to head (905d6bc) 85.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #832      +/-   ##
==========================================
- Coverage   85.30%   85.30%   -0.01%     
==========================================
  Files         281      281              
  Lines       22367    22365       -2     
  Branches     3388     3388              
==========================================
- Hits        19080    19078       -2     
+ Misses       2605     2603       -2     
- Partials      682      684       +2     

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