Add SSE polling support (SEP-1699) #3631

Job	Run time
checks / pre-commit	29s
checks / readme-snippets	10s
checks / test (3.10, lowest-direct, ubuntu-latest)	41s
checks / test (3.10, highest, ubuntu-latest)	36s
checks / test (3.10, lowest-direct, windows-latest)	1m 52s
checks / test (3.11, lowest-direct, ubuntu-latest)	37s
checks / test (3.12, lowest-direct, windows-latest)	2m 52s
checks / test (3.11, lowest-direct, windows-latest)	2m 8s
checks / test (3.11, highest, windows-latest)	2m 5s
checks / test (3.10, highest, windows-latest)	1m 59s
checks / test (3.12, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, highest, ubuntu-latest)	41s
checks / test (3.11, highest, ubuntu-latest)	39s
checks / test (3.13, lowest-direct, windows-latest)	2m 17s
checks / test (3.13, lowest-direct, ubuntu-latest)	36s
checks / test (3.13, highest, windows-latest)	2m 8s
checks / test (3.13, highest, ubuntu-latest)	36s
checks / test (3.12, highest, windows-latest)	3m 2s
	24m 13s

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