Send data in a thread

[davidbrochart]

When sending a message here:

hypercorn/src/hypercorn/protocol/ws_stream.py

Line 343 in ed6cd40

data = self.connection.send(event)

data can be compressed and it can be CPU-intensive depending on the size of the data. Do you think this call could be wrapped in a thread? There would need to be a backend-specific abstraction, but for instance for asyncio it would be equivalent to:

data = await asyncio.to_thread(self.connection.send, event)