Introduce SWITCH action for selecting proper transition

[marcinus]

Is your feature request related to a problem? Please describe.

• Imagine you want to process different responses from HTTP action differently. Say, the service you interact with is pointing you in the right direction, but different directions require different processing.
• Or let's say processing should be varied by a configuration parameter specified for the Fragment
• Or there is a need to diverge processing of graph based on some previous action's result

Describe the solution you'd like
switch Action Factory to the rescue! Configuration could look like this:

stuff {
   factory = switch
   config {
      condition = "{gateway-call._result.operationStatus}"
      _success = [ OK, ONGOING ]
      _error = [ FAILED, ABORTED ]
      defaultTransition = _fallback
    }
}

The syntax could be simple or rich:

• could support only single values
• could support arrays of accepted values
• could support regular expressions
• could support OR or AND logic between conditions
• could support parenthnesses and provide a full boolean logic support.

Note: a resolution mechanism should be considered for the cases when many transitions fit

Describe alternatives you've considered
An alternative is to write a custom action for each diversion case. It is actually a good solution for actions written for the specific job. But this does not really work when using builtin actions, like HttpAction - to apply such behaviour, a new action has to be written just to handle the transition.

Additional context
This is somehow related #49, but does not solve the issue.