Added ExactName param to GetResourceParams

[vennekilde]

Added exactName parameter when querying for resources, as described in https://github.com/keycloak/keycloak-documentation/blob/master/authorization_services/topics/service-protection-resources-api-papi.adoc#querying-resources

[codecov]

Codecov Report

Merging #313 (f4d4262) into main (42526f4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #313   +/-   ##
=======================================
  Coverage   76.10%   76.10%           
=======================================
  Files           4        4           
  Lines        1871     1871           
=======================================
  Hits         1424     1424           
  Misses        311      311           
  Partials      136      136           

Impacted Files	Coverage Δ
models.go	92.80% <ø> (ø)

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[Nerzal]

LGTM! Thank you for the contribution!