Allow success response codes to be specified in HTTP Action's config

[marcinus]

Is your feature request related to a problem? Please describe.
Sometimes 404 or 301 response code is considered successful for an unusual endpoint.
It's possible that only 200 response is expected and 204 should be rejected.
Currently, _success transition is returned from HttpAction whenever response code is between 200 and 300.

Describe the solution you'd like
Configurable _success response codes, e.g.:

get {
      factory = http
      config.endpointOptions {
          path = /service/mock/get.json
          domain = localhost
          port = ${test.random.service.port}
          successStatusCodes = "200,300-400"
        }
}

or provided in a different format. Interval support would be appreciated.

Describe alternatives you've considered
Currently no good alternative. Subsequent _success or _error action has to handle the ambiguity.

Additional context
Desired behaviour could be achieved if #128 was implemented.