refact: plugin config parsing

[mmetc]

[github-actions[bot]]

@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[bot]]

Codecov Report

Attention: Patch coverage is 77.77778% with 8 lines in your changes missing coverage. Please review.

Project coverage is 60.71%. Comparing base (b5d90ff) to head (e52abaf). Report is 19 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/crowdsec-cli/clinotifications/notifications.go	33.33%	3 Missing and 1 partial :warning:
pkg/csplugin/broker.go	86.66%	3 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3640      +/-   ##
==========================================
- Coverage   61.24%   60.71%   -0.54%     
==========================================
  Files         361      373      +12     
  Lines       40273    41151     +878     
==========================================
+ Hits        24667    24985     +318     
- Misses      13598    14116     +518     
- Partials     2008     2050      +42     

Flag	Coverage Δ
bats	44.72% <77.77%> (-0.01%)	:arrow_down:
unit-linux	34.27% <52.77%> (+<0.01%)	:arrow_up:
unit-windows	24.27% <52.77%> (?)

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