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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.60%. Comparing base (ea79f77) to head (3c5c216).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #949   +/-   ##
========================================
  Coverage    51.60%   51.60%           
========================================
  Files           17       17           
  Lines         1771     1771           
  Branches       232      214   -18     
========================================
  Hits           914      914           
+ Misses         856      850    -6     
- Partials         1        7    +6     

Flag	Coverage Δ
unittests	51.60% <ø> (ø)

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