This adds an experimental package to expose two work-in-progress features: * FunctionListener - for tracing etc. * Sys - to control random number generators Both the functionality and the names of the features above are not stable. However, this should help those who can tolerate drift a means to test things out. Signed-off-by: Adrian Cole <adrian@tetrate.io> Co-authored-by: Anuraag Agrawal <anuraaga@gmail.com>