Returns a specification to start this module under a supervisor.

See Supervisor.

@spec get_state(any(), any()) :: {:error, term()} | {:ok, term()}

Retrieve the Actor state direct from memory.

@spec invoke(any(), any(), any()) :: any()

Synchronously invokes an Action on an Actor.

@spec invoke_async(any(), any(), any()) :: :ok

Asynchronously invokes an Action on an Actor.