Changed ComponentConfig to be a map[string][]string instead of its own struct

[doktormerlin]

Covers issue #321

[doktormerlin]

In this PR I changed the existing ComponentConfig which would be a breaking change. Another possibility would be to create a second Component, GenericComponent or something like this, that would use map[string][]string as its ComponentConfig. However, since Keycloak Components are meant to be a generic type I think it makes more sense to always use map[string][string].

[codecov]

Codecov Report

Merging #325 (89825f5) into main (e1f4448) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #325   +/-   ##
=======================================
  Coverage   76.59%   76.59%           
=======================================
  Files           4        4           
  Lines        1961     1961           
=======================================
  Hits         1502     1502           
  Misses        319      319           
  Partials      140      140           

Impacted Files	Coverage Δ
models.go	92.75% <ø> (-0.06%)	⬇️
client.go	74.80% <100.00%> (ø)
utils.go	97.50% <100.00%> (+0.06%)	⬆️

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[Nerzal]

LGTM , thank you for the contribution

I'll create a new release as soon as i merged all PRs, that are on my List.
Will hapen this week!