Create OTP like behaviour

[adkron]

It would be nice for a user to be able to create something that mimics OTP and handles a lot of the processing and hands things to the user.

defmodule MyService do
  use DeonEx

  def start(_) do
    # ...
  end

  def init(_) do
    # ...
  end

  def handle_output(output, state) do
  end

  def handle_error(error, state) do
  end

  def send_input(deno_process, thing) do
    DenoEx.Send(deno_process, thing)
  end
end

This allows the user to track their state and progress. We can hide the majority of the deno process data from them and let them only handle their own deno state.