feat: WebSocket send stream #4458

Job	Run time
pyright	40s
mypy	1m 9s
slotscheck	21s
Test server integration (uvicorn<0.27.0)	45s
Test Minimal Application with Base Dependencies	16s
Test Minimal Pydantic 1 application	12s
Test server integration (uvicorn>=0.27.0)	43s
test-platform-compat	0s
validate	19s
test (3.10) / test	1m 43s
test (3.11) / test	1m 34s
test (3.12) / test	1m 48s
test (3.8) / test	1m 46s
test (3.9) / test	1m 48s
build-docs	2m 34s
codeql	0s
upload-test-coverage	0s
sonar	0s
	15m 38s

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