Integrate OAuth flow UI and RBAC roles

[magnusg-kdab]

This is the followup of fair-acc/opencmw-cpp#402 to integrate the OAuth flow and RBAC in the UI.

Once the user has signed in, available roles will be displayed in the UI. The public key is added to the keystore worker and messages can be signed and in turn other clients can cryptographically verify that the user does indeed have access to the role.

The available roles are configured on the keycloak/oauth-provider side and can be set dynamically depending on provided scope.

Note that the OAuth session does not survive application restarts yet, as there is no persistent cache yet and login is only available in editableMode.

Closes #203

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

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[magnusg-kdab]

Note the codacy "warnings" are all false positives: Those class members are all being used.

[drslebedev]

Thanks for the PR!

The changes look good to me.