Export stream helpers

[bradymadden97]

I think I want to use these in a stream handler I'm building:

• Only on stream open do I want to set up some listeners
• Only on stream close do I want to remove those listeners

This should make it easier than like manually checking ctrl flags

This can just get included in whatever the next release is, it's not urgent.

[jackyzha0]

Discussed in slack but this type of logic should be handle by waiting on the input stream to end in the handler. This is probably useful down the line so we can merge it but let's not rely on using it