Issue #3462517: Add revision parameter to route query

Closes #3462517

modules/graphql_compose_routes/src/Plugin/GraphQL/SchemaExtension/RouteSchemaExtension.php

@@ -67,6 +67,8 @@ class RouteSchemaExtension extends ResolverOnlySchemaExtensionPluginBase impleme
       'Query',
       'route',
       $builder->compose(
+        $builder->context('revision', $builder->fromArgument('revision')),
+
         // Get the language from the route path.
         $builder->produce('route_language')
           ->map('path', $builder->fromArgument('path'))
@@ -121,8 +123,13 @@ class RouteSchemaExtension extends ResolverOnlySchemaExtensionPluginBase impleme
     $registry->addFieldResolver(
       'RouteInternal',
       'entity',
-      $builder->produce('route_entity_extra')
-        ->map('url', $builder->fromParent())
+      $builder->compose(
+        $builder->produce('route_entity_extra')
+          ->map('url', $builder->fromParent()),
+        $builder->produce('entity_load_revision')
+          ->map('entity', $builder->fromParent())
+          ->map('identifier', $builder->fromContext('revision'))
+      )
     );
 
     $registry->addFieldResolver(