wip: guest account registration (self-service and booking create flow)

config/services.yaml

@@ -100,6 +100,10 @@ services:
                 stream_timeout: '%env(int:APP_BPN_STREAM_TIMEOUT)%'
                 total_timeout: '%env(int:APP_BPN_TOTAL_TIMEOUT)%'
 
+    App\BpnConnect\BpnConnectClient:
+        arguments:
+            $httpClient: '@bpn_connect.client'
+
     App\Twig\AppRuntime:
         arguments:
             $intlExtension: '@twig.extension.intl'
@@ -140,6 +144,7 @@ services:
         arguments:
             $registrationLimiter: '@limiter.registration'
             $passwordResetLimiter: '@limiter.password_reset'
+            $portalAccessRequestLimiter: '@limiter.portal_access_request'
 
     App\Service\TravelDataProvider:
         arguments: