Missing GQL_CONNECTION_INIT message in Subscriptions about swift-graphql

[Amzd]

Okay so I've done a bit more research on this issue.

There is two main websocket protocols that are really being used.

1. https://github.com/apollographql/subscriptions-transport-ws/blob/master/PROTOCOL.md

Appollos protocol which extremely loosely defines what messages can be sent but with very little detail on what should happen when the client sends undefined messages. It also doesn't mention authorization (maybe assuming that is sent in the request headers?) but since it's not defined, some libraries require it in the headers and some in the connection_init payload.

2. https://github.com/enisdenjo/graphql-ws/blob/master/PROTOCOL.md

This protocol defines way more specific what will happen when certain messages are sent and Apollo is moving to this right now: graphql/graphql-playground#1295

I originally based my subscriptions on the first protocol but we should look at supporting the new protocol, possibly with backwards compatibility.