logging: add a option to log milliseconds (Closes: #2454)

[sylvestre]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.25000% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.66%. Comparing base (a888c16) to head (0c90693).

Files with missing lines	Patch %	Lines
src/bin/sccache-dist/main.rs	0.00%	7 Missing ⚠️
tests/logging.rs	93.84%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2455      +/-   ##
==========================================
+ Coverage   71.62%   71.66%   +0.04%     
==========================================
  Files          65       66       +1     
  Lines       36459    36530      +71     
==========================================
+ Hits        26112    26181      +69     
- Misses      10347    10349       +2     

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