Support GraphQL over WebSockets

[amondnet]

https://github.com/apollographql/subscriptions-transport-ws/blob/master/README.md#graphql-ws

They recommend using graphql-ws instead of subscriptions-transport-ws .

The subscriptions-transport-ws library is not being actively maintained. It is recommended that you use the graphql-ws library instead. For details read the GraphQL over WebSockets announcement.

https://github.com/enisdenjo/graphql-ws/blob/master/PROTOCOL.md
https://the-guild.dev/blog/graphql-over-websockets

GraphQL over WebSocket Protocol with full support for all 3 GraphQL operations: Queries, Mutations and Subscriptions.

[amondnet]

#686