resiliency

Issue Description

Type: feature request

Describe what feature you want

Improve performance (CPU footprint) of `util.CurrentTimeMill

I try to run an experiment with variables configured in "configuration"
"configuration":{ "waitTime": 3 }
There it´s defined as Number
Then I want to use this var in pauses

"pauses":{ "after": "${waitTime}"}

This results into an error that pauses needs a Number
Can it be fixed that variables can be uses also in "pauses" ?

It would be great to have support for Kafka streams in the outboxer. Using the segment kafka library seems to be a good option.