Add slok/go-http-metrics SLI plugins

[slok]

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[slok]

Codecov Report

Merging #9 (17491ce) into main (3486521) will decrease coverage by 4.39%.
The diff coverage is 85.50%.

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   95.00%   90.60%   -4.40%     
==========================================
  Files           4        6       +2     
  Lines          80      149      +69     
==========================================
+ Hits           76      135      +59     
- Misses          2        7       +5     
- Partials        2        7       +5     

Impacted Files	Coverage Δ
...lugins/kubernetes/apiserver/availability/plugin.go	91.30% <ø> (ø)
plugins/kubernetes/apiserver/latency/plugin.go	93.54% <ø> (ø)
plugins/slok-go-http-metrics/latency/plugin.go	82.60% <82.60%> (ø)
...lugins/slok-go-http-metrics/availability/plugin.go	91.30% <91.30%> (ø)

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