Make memory-logging optional (off by default)

[jwodder]

Closes #154.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 68.88%. Comparing base (f96f642) to head (d2c3103).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main.rs	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #234      +/-   ##
==========================================
- Coverage   69.13%   68.88%   -0.26%     
==========================================
  Files          33       33              
  Lines        5113     5119       +6     
==========================================
- Hits         3535     3526       -9     
- Misses       1578     1593      +15     

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