Calculate mean leakage

[tjgalvin]

Add a mean compute mode when estimating the leakage

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 36.84211% with 12 lines in your changes missing coverage. Please review.

Project coverage is 56.23%. Comparing base (1e62863) to head (71a2ec8).

Files	Patch %	Lines
flint/leakage.py	36.84%	12 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
- Coverage   56.24%   56.23%   -0.02%     
==========================================
  Files          33       33              
  Lines        5092     5104      +12     
==========================================
+ Hits         2864     2870       +6     
- Misses       2228     2234       +6     

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