GraphQL schema is transformed on every request, leading to performance issues

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Hi, GraphQLJpaExecutorContext transforms the schema field visibility rules on every request and it leads to performance drop.

Specifically, in https://github.com/introproventures/graphql-jpa-query/blob/master/graphql-jpa-query-schema/src/main/java/com/introproventures/graphql/jpa/query/schema/impl/GraphQLJpaExecutorContext.java#L108 :

   @Override
    public GraphQLSchema getGraphQLSchema() {
        GraphQLCodeRegistry codeRegistry = graphQLSchema.getCodeRegistry()
                                                        .transform(builder -> builder.fieldVisibility(graphqlFieldVisibility.get()));

        return graphQLSchema.transform(builder -> builder.codeRegistry(codeRegistry));
    }

Correct me, if I'm wrong, It seems that graphQLSchema and graphqlFieldVisibility are set once when GraphQLJpaExecutorContext is created, and the result of transformation is always the same, therefore this transformation can be applied only once when GraphQLJpaExecutorContext is created and not on every request. When we updated this code, we got a huge performance boost.

BTW, thanks for library, it's cool!