Changes for path independence check

[slundqui]

1. Adding assertions that closing trades in path independence happen on the same checkpoint
2. Adding block timestamp interval to interactive hyperdrive that forces the time between mined blocks (previously using system time). Setting this to be the default, with 12 seconds per mined block.
3. Adding option to set variable interest in setup_fuzz, and setting it to 0 for path independence test.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ea12400) 80.45% compared to head (d12abd6) 80.47%.

Files	Patch %	Lines
lib/agent0/agent0/hyperdrive/interactive/chain.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1242      +/-   ##
==========================================
+ Coverage   80.45%   80.47%   +0.01%     
==========================================
  Files          94       94              
  Lines        5342     5346       +4     
==========================================
+ Hits         4298     4302       +4     
  Misses       1044     1044              

Flag	Coverage Δ
unittests	80.47% <85.71%> (+0.01%)	⬆️

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