Add ability to ping send Application data #4593
Description
What?
Add the possibility of sending application data with WebSocket.ping.
The WebSocker protocol says:
[5.5.2](https://www.rfc-editor.org/rfc/rfc6455#section-5.5.2). Ping The Ping frame contains an opcode of 0x9. A Ping frame MAY include "Application data".