add missing Ecto behavior impls

Author: mweidner037

lib/mongo_ecto.ex

@@ -726,7 +726,7 @@ defmodule Mongo.Ecto do
   end
 
   @impl true
-  def delete(repo, meta, filter, opts) do
+  def delete(repo, meta, filter, _remaining, opts) do
     normalized = NormalizedQuery.delete(meta, filter)
 
     Connection.delete(repo, normalized, opts)
@@ -759,6 +759,11 @@ defmodule Mongo.Ecto do
     fun.()
   end
 
+  @impl true
+  def checked_out?(_) do
+    false
+  end
+
   ## Storage
 
   # Noop for MongoDB, as any databases and collections are created as needed.