Add LogExpFunctions package extension

[adrhill]

Closes #171.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.58%. Comparing base (61efc9a) to head (4b33180).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
+ Coverage   90.44%   90.58%   +0.13%     
==========================================
  Files          44       46       +2     
  Lines        2041     2071      +30     
==========================================
+ Hits         1846     1876      +30     
  Misses        195      195              

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