Make the logger an interface

[zeripath]

Extracted from #12264

Refactor Logger to make a logger interface and make it possible to
wrap loggers for specific purposes.

[codecov-io]

Codecov Report

Merging #13294 into master will decrease coverage by 0.02%.
The diff coverage is 57.30%.

@@            Coverage Diff             @@
##           master   #13294      +/-   ##
==========================================
- Coverage   42.15%   42.12%   -0.03%     
==========================================
  Files         690      691       +1     
  Lines       75888    75909      +21     
==========================================
- Hits        31987    31974      -13     
- Misses      38663    38694      +31     
- Partials     5238     5241       +3     

Impacted Files	Coverage Δ
models/log.go	36.58% <ø> (ø)
modules/indexer/code/elastic_search.go	1.76% <ø> (ø)
modules/log/colors.go	71.23% <ø> (-1.37%)	⬇️
modules/log/level.go	72.50% <0.00%> (-12.80%)	⬇️
modules/log/logger.go	10.52% <8.33%> (-52.86%)	⬇️
modules/log/log.go	58.08% <60.00%> (ø)
modules/log/multichannel.go	87.50% <87.50%> (ø)
modules/indexer/issues/elastic_search.go	67.21% <100.00%> (ø)
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
modules/charset/charset.go	68.53% <0.00%> (-4.50%)	⬇️
... and 4 more

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[techknowlogick]

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