### Product Hot Chocolate ### Is your feature request related to a problem? HotChocolate.Transport.Http.GraphQLHttpEventStreamProcessor should not throw an error when a message like ``` event: next data: {} ``` is sent from the server ### The solution you'd like GraphQLHttpEventStreamProcessor should ignore those events https://www.apollographql.com/docs/graphos/routing/operations/subscriptions/multipart-protocol#heartbeats