Is there any way to evaluate a `Characteristic.Value` when I read the value? [`muka/go-bluetooth`](https://github.com/muka/go-bluetooth) can use [`onRead`](https://github.com/muka/go-bluetooth/blob/07f31c601d335ebe336c5923b2b66b2420d8e8aa/api/service/app_char.go#L153) to setup a read callback, can this repo add something like `CharacteristicConfig.ReadEvent`?