Datasource/kafka

[he2ss]

Add kafka datasource, with documentation (crowdsecurity/crowdsec-docs#264)

[codecov-commenter]

Codecov Report

Merging #1698 (d437674) into master (15a9e16) will decrease coverage by 3.78%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1698      +/-   ##
==========================================
- Coverage   53.45%   49.66%   -3.79%     
==========================================
  Files         136      117      -19     
  Lines       18980    17385    -1595     
==========================================
- Hits        10145     8635    -1510     
- Misses       7715     7741      +26     
+ Partials     1120     1009     -111     

Flag	Coverage Δ
func-crowdsec	51.58% <ø> (+5.74%)	⬆️
func-cscli	42.15% <ø> (-2.03%)	⬇️
unit-linux	?
unit-windows	53.51% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/acquisition/acquisition.go	75.75% <0.00%> (-0.47%)	⬇️
pkg/apiclient/metrics.go	0.00% <0.00%> (-76.93%)	⬇️
pkg/acquisition/modules/journalctl/journalctl.go	0.00% <0.00%> (-71.74%)	⬇️
pkg/apiclient/signal.go	0.00% <0.00%> (-50.00%)	⬇️
pkg/acquisition/modules/kinesis/kinesis.go	0.00% <0.00%> (-34.24%)	⬇️
pkg/types/utils.go	0.00% <0.00%> (-32.65%)	⬇️
pkg/csplugin/watcher.go	69.30% <0.00%> (-25.75%)	⬇️
pkg/time/rate/rate.go	71.73% <0.00%> (-12.18%)	⬇️
pkg/csconfig/api.go	43.44% <0.00%> (-9.84%)	⬇️
pkg/csplugin/broker.go	64.61% <0.00%> (-5.77%)	⬇️
... and 47 more

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[sabban]

lgtm