Add SSE polling support (SEP-1699) #3615

Job	Run time
checks / pre-commit	29s
checks / readme-snippets	16s
checks / test (3.10, lowest-direct, windows-latest)	1m 53s
checks / test (3.10, lowest-direct, ubuntu-latest)	42s
checks / test (3.10, highest, ubuntu-latest)	37s
checks / test (3.11, lowest-direct, windows-latest)	2m 3s
checks / test (3.11, highest, ubuntu-latest)	38s
checks / test (3.10, highest, windows-latest)	2m 1s
checks / test (3.11, highest, windows-latest)	2m 6s
checks / test (3.12, lowest-direct, windows-latest)	3m 13s
checks / test (3.12, highest, ubuntu-latest)	45s
checks / test (3.11, lowest-direct, ubuntu-latest)	38s
checks / test (3.13, lowest-direct, ubuntu-latest)	35s
checks / test (3.13, lowest-direct, windows-latest)	2m 26s
checks / test (3.12, highest, windows-latest)	2m 55s
checks / test (3.13, highest, windows-latest)	2m 20s
checks / test (3.12, lowest-direct, ubuntu-latest)	43s
checks / test (3.13, highest, ubuntu-latest)	37s
	24m 57s

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