Adding accrue interest logic for ezeth

[slundqui]

This PR adds the structure for implementing accrual interest logic in fork fuzzing. Currently, only ezeth is implemented.

[codecov]

Codecov Report

Attention: Patch coverage is 79.16667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 81.29%. Comparing base (7715078) to head (aeea553).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/agent0/hyperfuzz/system_fuzz/run_fuzz_bots.py	76.47%	4 Missing ⚠️
...t0/core/hyperdrive/interactive/hyperdrive_agent.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1719      +/-   ##
==========================================
+ Coverage   80.81%   81.29%   +0.47%     
==========================================
  Files          93       93              
  Lines        7007     7013       +6     
==========================================
+ Hits         5663     5701      +38     
+ Misses       1344     1312      -32     

Flag	Coverage Δ
unittests	81.29% <79.16%> (+0.47%)	⬆️

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