Oleksandr Vizghalov

For now it is possible to set own dependency injector for executor using [WithDependencyInjector](https://github.com/graphql-dotnet/conventions/blob/master/src/GraphQL.Conventions/Adapters/Engine/GraphQLExecutor.cs#L90) method. Then using `InjectAttribute` for parameters of Query methods we can inject scoped services using provided...