quarkus: Allow quarkus-oidc to customize response body of 403

Description When using quarkus-oidc, providing a wrong token (expired, wrong signature, realm, …) returns a forbidden status, as expected. However, the response body is always empty.

In order to migrate an existing API (which already defines its own response bodies), we would require from quarkus-oidc the possibility to customize and give more information in the response body.

For example, an expired token could produce this response body:

{
   "reason": "token_expired",
   "message": "Your token is expired."
}