メモ
    binding.recycler.addOnScrollListener(object: RecyclerView.OnScrollListener() {
      override fun onScrolled(recyclerView: RecyclerView?, dx: Int, dy: Int) {
        super.onScrolled(recyclerView, dx, dy)
        val layoutManager = recyclerView.layoutManager as LinearLayoutManager

        val visibleItemCount = layoutManager.childCount
        val totalItemCount = layoutManager.itemCount
        val pastVisibleItems = layoutManager.findFirstVisibleItemPosition()
        if (pastVisibleItems + visibleItemCount >= totalItemCount) {
          // ここで最後までスクロールした時の処理を書く
        }
      }
    })