Fix event decoder

[slundqui]

Event decoder in agent0 wasn't working for nested event types. This PR allows the event decoder to properly decode nested types to look for topic hashes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.36%. Comparing base (f203fa1) to head (0fd26b5).
Report is 64 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1669      +/-   ##
==========================================
- Coverage   82.39%   82.36%   -0.04%     
==========================================
  Files          98       98              
  Lines        7486     7495       +9     
==========================================
+ Hits         6168     6173       +5     
- Misses       1318     1322       +4     

Flag	Coverage Δ
unittests	82.36% <100.00%> (-0.04%)	⬇️

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[wakamex]

lgtm, you can ignore these nits if you want, they're really minor