improvement: add ForbiddenField exception

lib/ash/error/forbidden/forbidden_field.ex

@@ -0,0 +1,18 @@
+defmodule Ash.Error.Forbidden.ForbiddenField do
+  @moduledoc "Raised in cases where access to a specific field was prevented"
+
+  require Logger
+  use Ash.Error.Exception
+
+  def_ash_error([:resource, :field], class: :forbidden)
+
+  defimpl Ash.ErrorKind do
+    def id(_), do: Ecto.UUID.generate()
+
+    def message(error) do
+      "Forbidden: cannot access #{error.field} on #{inspect(error.resource)}"
+    end
+
+    def code(_), do: "forbidden_field"
+  end
+end