refact logging configuration; add log_media="syslog"

[mmetc]

• simplify and centralize the set up of subloggers
• add "method" field to each sublogger
• define common interface for Logger and Entry with Trace/Tracef methods (FieldLogger does not have them)
• add support for syslog output

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

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[codecov]

Codecov Report

❌ Patch coverage is 64.36364% with 98 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.72%. Comparing base (f2a4aef) to head (c901213).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/logging/syslog.go	0.00%	30 Missing ⚠️
cmd/crowdsec/flags.go	68.75%	14 Missing and 1 partial ⚠️
cmd/crowdsec/main.go	56.00%	9 Missing and 2 partials ⚠️
pkg/logging/standard.go	70.83%	7 Missing ⚠️
pkg/csplugin/hclog_adapter.go	25.00%	6 Missing ⚠️
cmd/crowdsec/run_in_svc_windows.go	0.00%	5 Missing ⚠️
pkg/apiserver/apiserver.go	50.00%	4 Missing and 1 partial ⚠️
cmd/crowdsec-cli/clipapi/papi.go	33.33%	4 Missing ⚠️
cmd/crowdsec/win_service.go	0.00%	4 Missing ⚠️
cmd/crowdsec-cli/clinotifications/notifications.go	0.00%	2 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4045      +/-   ##
==========================================
- Coverage   62.74%   62.72%   -0.02%     
==========================================
  Files         459      464       +5     
  Lines       33067    33047      -20     
==========================================
- Hits        20747    20728      -19     
- Misses      10197    10214      +17     
+ Partials     2123     2105      -18     

Flag	Coverage Δ
bats	46.29% <60.98%> (-0.08%)	⬇️
unit-linux	35.35% <19.31%> (-0.10%)	⬇️
unit-windows	24.75% <14.04%> (-0.08%)	⬇️

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