Added params for getting sessions associated with client

[mopo3ula]

Added params GetClientUserSessionsParams for GetClientUserSessions and GetClientOfflineSessions to match Keycloak API

[Nerzal]

Hi, thank you for your contribution.
That change would be a breaking change.

How do you feel about changes the parameters to variadic functions.
That would not break integrations and still provide the feature.

https://gobyexample.com/variadic-functions

[mopo3ula]

@Nerzal made variadic functions and added tests to compare result with and without params

[codecov]

Codecov Report

Merging #436 (e32f4b7) into main (166f442) will increase coverage by 0.01%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##             main     #436      +/-   ##
==========================================
+ Coverage   77.25%   77.26%   +0.01%     
==========================================
  Files           4        4              
  Lines        2198     2261      +63     
==========================================
+ Hits         1698     1747      +49     
- Misses        338      345       +7     
- Partials      162      169       +7     

Impacted Files	Coverage Δ
client.go	75.82% <77.41%> (+0.04%)	⬆️
models.go	90.38% <100.00%> (+0.06%)	⬆️

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[Nerzal]

Thank you for the contribution!