document to use e.enif_send usage from callbacks outside of the beam environment

[ityonemo]

[rbino]

What kind of documentation were you thinking about? I have some working code that does this in TigerBeetlex so I'm happy to contribute with some examples here

[ityonemo]

I just need to make it clear how you're supposed to use e.enif_send instead of beam.send when you don't have access to env, I think. I am refactoring how env works in zigler for 0.12

[ityonemo]

closed, since beam.send now automatically selects based on env.