CLIENT-2740 - Create an alternative to Python client's LOG_LEVEL_OFF

[DomPeliniAerospike]

Added support for None parameter in set_log_handler Fixed LOG_LEVEL_OFF Added a logging example

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (26f4ea8) 81.25% compared to head (f0bdf8f) 81.46%. Report is 2 commits behind head on stage.

Files	Patch %	Lines
src/main/log.c	91.83%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##            stage     #572      +/-   ##
==========================================
+ Coverage   81.25%   81.46%   +0.20%     
==========================================
  Files          99       99              
  Lines       14897    14915      +18     
==========================================
+ Hits        12105    12150      +45     
+ Misses       2792     2765      -27     

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