[feature/dataflow] Allow DynamicallyAccessedMembers on generic types

[eerhardt]

In System.Text.Json, we have code like the following

        internal static void Serialize<T>(
            Utf8JsonWriter writer,
            T value,
            JsonSerializerOptions options,
            ref WriteStack state,
            string? propertyName = null)
        {
            if (options == null)
            {
                throw new ArgumentNullException(nameof(options));
            }

            JsonConverter jsonConverter = state.Current.InitializeReEntry(typeof(T), options, propertyName);
            bool success = jsonConverter.TryWriteAsObject(writer, value, options, ref state);
            Debug.Assert(success);
        }

Here the type T needs to be annotated with DynamicallyAccessedMemberKinds.Properties because InitializeReEntry will eventually need to access all the properties on T. However, the linker currently doesn't recognize when I try to annotate the method like the following:

        internal static void Serialize<[DynamicallyAccessedMembers(DynamicallyAccessedMemberKinds.Properties)] T>(
            Utf8JsonWriter writer,
            T value,
            JsonSerializerOptions options,
            ref WriteStack state,
            string? propertyName = null)
        {

cc @MichalStrehovsky @vitek-karas