feat: add support for opsgenie

[piksel]

Update of #73 with solved merge conflicts

[codecov]

Codecov Report

Merging #140 (394e38c) into main (fd3e82d) will increase coverage by 0.72%.
The diff coverage is 73.83%.

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
+ Coverage   61.77%   62.50%   +0.72%     
==========================================
  Files          62       65       +3     
  Lines        1758     1864     +106     
==========================================
+ Hits         1086     1165      +79     
- Misses        561      576      +15     
- Partials      111      123      +12     

Impacted Files	Coverage Δ
pkg/format/format_query.go	0.00% <0.00%> (ø)
pkg/services/opsgenie/opsgenie.go	69.38% <69.38%> (ø)
pkg/services/opsgenie/opsgenie_entity.go	71.42% <71.42%> (ø)
pkg/services/opsgenie/opsgenie_config.go	85.71% <85.71%> (ø)
pkg/router/servicemap.go	100.00% <100.00%> (ø)

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[simskij]

@all-contributors add @JonasPf for code

[allcontributors]

@simskij

I've put up a pull request to add @JonasPf! 🎉