feat(block-util): add fuzzer for external messages

[pashinov]

No description provided.

[github-actions]

🧪 Network Tests

To run network tests for this PR, use:

gh workflow run network-tests.yml -f pr_number=1069

Available test options:

• Run all tests: gh workflow run network-tests.yml -f pr_number=1069
• Run specific test: gh workflow run network-tests.yml -f pr_number=1069 -f test_selection=ping-pong

Test types: destroyable, ping-pong, one-to-many-internal-messages, fq-deploy, nft-index, persistent-sync

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.92%. Comparing base (dbe5086) to head (c609463).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1069      +/-   ##
==========================================
- Coverage   56.95%   56.92%   -0.03%     
==========================================
  Files         448      448              
  Lines       74759    74770      +11     
  Branches    74759    74770      +11     
==========================================
- Hits        42582    42566      -16     
- Misses      30090    30110      +20     
- Partials     2087     2094       +7     

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