[bugfix] fix possible mutex lockup during streaming code (#2633)

* rewrite Stream{} to use much less mutex locking, update related code

* use new context for the stream context

* ensure stream gets closed on return of writeTo / readFrom WSConn()

* ensure stream write timeout gets cancelled

* remove embedded context type from Stream{}, reformat log messages for consistency

* use c.Request.Context() for context passed into Stream().Open()

* only return 1 boolean, fix tests to expect multiple stream types in messages

* changes to ping logic

* further improved ping logic

* don't export unused function types, update message sending to only include relevant stream type

* ensure stream gets closed 🤦

* update to error log on failed json marshal (instead of panic)

* inverse websocket read error checking to _ignore_ expected close errors

internal/processing/stream/notification_test.go

@@ -49,10 +49,11 @@ func (suite *NotificationTestSuite) TestStreamNotification() {
 		Account:   followAccountAPIModel,
 	}
 
-	err = suite.streamProcessor.Notify(notification, account)
-	suite.NoError(err)
+	suite.streamProcessor.Notify(context.Background(), account, notification)
+
+	msg, ok := openStream.Recv(context.Background())
+	suite.True(ok)
 
-	msg := <-openStream.Messages
 	dst := new(bytes.Buffer)
 	err = json.Indent(dst, []byte(msg.Payload), "", "  ")
 	suite.NoError(err)