Introduced timeless_log option so logging is deterministic

[jajhall]

When developing, it's handy to be able to use diff/meld to compare output, and if this option is true, no times are printed, and logging intervals are deterministic

[codecov]

Codecov Report

Attention: Patch coverage is 89.83051% with 6 lines in your changes missing coverage. Please review.

Project coverage is 78.69%. Comparing base (c13d1a0) to head (7c0620a).
Report is 17 commits behind head on latest.

Files with missing lines	Patch %	Lines
src/mip/HighsMipSolverData.cpp	75.00%	5 Missing ⚠️
src/lp_data/HighsOptions.h	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           latest    #2147      +/-   ##
==========================================
+ Coverage   78.65%   78.69%   +0.04%     
==========================================
  Files         345      345              
  Lines       83072    83107      +35     
==========================================
+ Hits        65338    65399      +61     
+ Misses      17734    17708      -26     

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