Add reconciliation of authorization services in KeycloakClients

[kereis]

Related GH Issue

Closes #11

Additional Information

In KeycloakClients, you can specify settings for authorization services. In its current state, the operator is not able to handle them correctly. keycloak/keycloak#16998 also addresses an issue with the client REST API because if the exported client.json contains authorization settings with policies referring to roles, the import fails because Keycloak cannot find the relevant roles at import time.

This MR adds a reconciliation logic explicitly for authorization settings and tries to maintain its state, regardless of the former mentioned issue.

Verification Steps

1. Prepare a KeycloakClient CR containing authorizationSettings. This can be easily obtained by configuring authorization in Keycloak, then exporting the realm either via Admin Console or CLI.
2. Checkout and run this MR
3. Check the logs for reconciliation of authorization settings
4. Keycloak should no longer throw exceptions when importing clients containing authorization settings
5. Open authorization settings of the imported client in the Admin Console and check if the custom policies, resources etc. are present
6. Change some data and check if the operator overwrites them again
7. Change policy names and update references in CR to check if the operator can handle these changes

Checklist:

• Automated Tests
• Documentation changes if necessary
• (If required) Discussed on Keycloak DEV