feat[test]: add more coverage to abi_decode fuzzer tests

[charles-cooper]

What I did

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Commit message

fuzz with `unwrap_tuple=False`
add fuzzing for structs

follow up to 69e5c0541a9b23

Description for the changelog

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.95%. Comparing base (69e5c05) to head (49b0081).

❗ Current head 49b0081 differs from pull request most recent head a1cc924

Please upload reports for the commit a1cc924 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4153      +/-   ##
==========================================
- Coverage   91.32%   88.95%   -2.38%     
==========================================
  Files         109      109              
  Lines       15557    15557              
  Branches     3416     3416              
==========================================
- Hits        14207    13838     -369     
- Misses        920     1218     +298     
- Partials      430      501      +71     

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