Add fuzzing harnesses

[bboilot-ledger]

Description

Please provide a detailed description of what was done in this PR.
(And mentioned if linked to an issue docs)

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it.

Additional comments

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 51.60%. Comparing base (59bb2cb) to head (2cb2075).

Files with missing lines	Patch %	Lines
src/features/generic_tx_parser/gtp_field.c	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #949      +/-   ##
===========================================
- Coverage    51.60%   51.60%   -0.01%     
===========================================
  Files           17       17              
  Lines         1771     1773       +2     
  Branches       232      233       +1     
===========================================
+ Hits           914      915       +1     
- Misses         856      857       +1     
  Partials         1        1              

Flag	Coverage Δ
unittests	51.60% <50.00%> (-0.01%)	⬇️

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[bboilot-ledger]

👋 Tagged you both but one review is more than enough I guess :)