Juniper: Implement Subscriptions for juniper-actix

[mihai-dinculescu]

It would be awesome to have subscriptions in juniper-actix.

I'm willing to put effort into making it happen, but I will need some guidance.

[LegNeato]

That would be great! What guidance do you need?

[mihai-dinculescu]

Tbh I think that I'm OK for now.

So far I have:

• got a new examples/actix_subscriptions example up and running based on the juniper_actix example
• Followed the Actix WS example to get a Juniper Subscription to connect to the Actix WS

Next, I will look into actually implementing the WS handler. juniper_warp::subscriptions and the Actix WS examples should help me get there.

[LegNeato]

Looks like this landed, thank you!