Apply log filtering to syslog with env_filter crate

[samuel-jimenez]

Expands --syslog argument to accept a comma-separated list of directives to control logging in the same manner as SCCACHE_LOG.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 31 lines in your changes missing coverage. Please review.

Project coverage is 67.50%. Comparing base (0cc0c62) to head (5a88ea6).
Report is 178 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bin/sccache-dist/cmdline/parse.rs	0.00%	31 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2343       +/-   ##
===========================================
+ Coverage   30.91%   67.50%   +36.59%     
===========================================
  Files          53       65       +12     
  Lines       20112    35458    +15346     
  Branches     9755        0     -9755     
===========================================
+ Hits         6217    23936    +17719     
- Misses       7922    11522     +3600     
+ Partials     5973        0     -5973     

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[sylvestre]

could you please add a test to verify that it works correctly ? and won't regress in the future

[sylvestre]

please reopen when ready