Support async eval

[et2010]

Hi, Oleh

Could you please consider adding async eval to lpy? Or if you don't have time to do that, could you please point a direction for me? I wan't to help but I'm not skilled at elisp or python.

[abo-abo]

Hi. I've wanted to add async eval as well for a long time. It's just that it is a lot easier to write functions that re-use the sync eval.

I'll look into this when I get some time. It's tricky to get it right.