Need to pass `Idaas\OpenID\ResponseTypes\BearerTokenResponse` to `AuthorizationServer` constructor.

[mricherzhagen]

If the Idaas\OpenID\ResponseTypes\BearerTokenResponse is not passed to the AuthorizationServer constructor as the responseType the $result will be a League\OAuth2\Server\ResponseTypes\BearerTokenResponse and not a Idaas\OpenID\ResponseTypes\BearerTokenResponse (The @var is also wrong):

openid-connect-server/src/Grant/AuthCodeGrant.php

Lines 176 to 179 in ea20f8f

	/**
	* @var BearerTokenResponse $result
	*/
	$result = parent::respondToAccessTokenRequest($request, $responseType, $accessTokenTTL);

The League BearerTokenResponse does not have the setIdToken method, so it crashes here:

openid-connect-server/src/Grant/AuthCodeGrant.php

Line 220 in ea20f8f

$result->setIdToken($idToken);

This should be probably fixed in the README and a proper type-assert should be added to the AuthCodeGrant.

 // Setup the authorization server
 $server = new \League\OAuth2\Server\AuthorizationServer(
     $clientRepository,
     $accessTokenRepository,
     $scopeRepository,
     $privateKey,
-    $encryptionKey
+    $encryptionKey,
+    new \Idaas\OpenID\ResponseTypes\BearerTokenResponse,
 );