Add SSE polling support (SEP-1699) #3550

Job	Run time
checks / pre-commit	28s
checks / test (3.10, lowest-direct, ubuntu-latest)	43s
checks / readme-snippets	14s
checks / test (3.10, highest, ubuntu-latest)	45s
checks / test (3.10, highest, windows-latest)	1m 58s
checks / test (3.10, lowest-direct, windows-latest)	2m 1s
checks / test (3.11, lowest-direct, windows-latest)	2m 10s
checks / test (3.12, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, highest, ubuntu-latest)	45s
checks / test (3.13, highest, windows-latest)	2m 13s
checks / test (3.12, highest, ubuntu-latest)	50s
checks / test (3.13, highest, ubuntu-latest)	43s
checks / test (3.12, lowest-direct, windows-latest)	3m 10s
checks / test (3.11, lowest-direct, ubuntu-latest)	41s
checks / test (3.11, highest, windows-latest)	2m 14s
checks / test (3.12, highest, windows-latest)	3m 26s
checks / test (3.13, lowest-direct, windows-latest)	2m 2s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
	25m 55s

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