Add log file entry to backend engine

[KedoKudo]

This PR introduces the following changes:

• Allow user to specify a log file to duplicate logging stream.
• Example json file is updated to reflect the change.

EWM item: Story4308

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.62%. Comparing base (2fb979b) to head (31ef8b7).

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #297      +/-   ##
==========================================
+ Coverage   94.58%   94.62%   +0.04%     
==========================================
  Files          21       21              
  Lines        1255     1266      +11     
==========================================
+ Hits         1187     1198      +11     
  Misses         68       68              

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[peterfpeterson]

The changes look reasonable