Add a new property used to determine whether or not to await the execution of a process

[cdavernas]

What would you like to be added:

Add a new property used to determine whether or not to await the execution of a process

Why is this needed:

Allows authors to fire-and-forget a process, such as a workflow, just like it was possible in previous versions of the DSL.

My proposal is to add a new await (boolean) property to the run concept, thus making that option available to container, script, shell and workflow processes.