ELY-2234 added the ability to configure use-realm-role-mappings in the JSON configuration for OpenID Connect.

This task is to add the ability to configure use-realm-role-mappings in the elytron-oidc-client subsystem.

Taking a look at an existing attribute that can be configured in the elytron-oidc-client subsystem (e.g., searching for use-resource-role-mappings) should help with figuring out the changes required for this task.

Note that this issue will depend on an Elytron release that includes the changes for ELY-2234.