Behaviour for conversation persistence.
Summary
Callbacks
@callback load_conversation(term()) :: {:ok, CommBus.Conversation.t()} | {:error, :not_found}
@callback store_conversation(CommBus.Conversation.t()) :: {:ok, CommBus.Conversation.t()} | {:error, term()}
@callback update_conversation(term(), map()) :: {:ok, CommBus.Conversation.t()} | {:error, term()}