Subtasks with name

[tomaszmichalak]

Is your feature request related to a problem? Please describe.
The current event log contains details about processed subtasks node in the form:

Alias	Transition	Node Log
A1	T1	L1
A2	T2	L2
"composite"

Describe the solution you'd like
I would like to name subtasks node:

node {
  factory = subtasks
  config {
    alias = subgraphA
    subtasks = [
      { 
        # subtask rootNodeDefinition
      },
      ...
    ]
  }
}

And in the event log see:

Alias	Transition	Node Log
A1	T1	L1
A2	T2	L2
"subgraphA"

Describe alternatives you've considered
Change log representation to graph.

[tomaszmichalak]

To verify.