[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/workers/surfacenotify.go

@@ -394,10 +394,7 @@ func (s *surface) notify(
 	if err != nil {
 		return gtserror.Newf("error converting notification to api representation: %w", err)
 	}
-
-	if err := s.stream.Notify(apiNotif, targetAccount); err != nil {
-		return gtserror.Newf("error streaming notification to account: %w", err)
-	}
+	s.stream.Notify(ctx, targetAccount, apiNotif)
 
 	return nil
 }