client-api: Send WebSocket messages fragmented #2931
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RFC 6455, Section 5.4 describes message fragmentation, and we can do that with tungstenite.
It does seem to help getting control messages (ping, pong, close) through without head-of-line blocking.
Expected complexity level and risk
2 - Need to test with clients
Testing
TBD - some more abstraction is needed due to the difficulty of synthetically producing a large outgoing message.