Process manager idle process timeout

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Every started instance of a process manager runs indefinitely. To reduce memory usage this pull request adds an idle timeout configuration (in milliseconds) after which an instance process will be shutdown.

The process will be restarted on demand, whenever an event is routed to it, and its state will be rehydrated from the instance snapshot.

Example

Define the idle_timeout option in the process manager module:

defmodule ExampleProcessManager do
  use Commanded.ProcessManagers.ProcessManager,
    name: "ExampleProcessManager",
    router: ExampleRouter,
    idle_timeout: :timer.minutes(10)
end

Or provide the timeout on start:

ExampleProcessManager.start_link(idle_timeout: 10_000)

By default the idle timeout will be configured as :infinity so every process manager instance will run indefinitely once started.

Fixes #148.

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Published to Hex as v0.18.1 and v0.17.5 releases.