Add support for DiffUtils

[sockeqwe]

We could leverage the power of kotlin DSL even more to add support for DiffUtils. Something like that:

fun catAdapterDelegate() = adapterDelegate<Cat, Animal>(R.layout.item_cat) {

    val name : TextView = findViewById(R.id.name)
   
    bind { diffPayloads -> // diffPayloads is a List<Any> containing the Payload from your DiffUtils
        name.text = item.name // Item is of type Cat and is the current bound item.
    }

   diff {
      itemsTheSame { old, new -> old == new }   // returns true if they are the same
      contentTheSame {
         same { old, new -> false }             // returns true if content is the same
         changePayload { old, new -> ... }      // returns the payload
      }
   }
}