Add SSE polling support (SEP-1699) #3559

Job	Run time
checks / pre-commit	17s
checks / readme-snippets	11s
checks / test (3.10, lowest-direct, windows-latest)	1m 58s
checks / test (3.10, highest, ubuntu-latest)	42s
checks / test (3.11, lowest-direct, ubuntu-latest)	43s
checks / test (3.11, lowest-direct, windows-latest)	2m 7s
checks / test (3.10, highest, windows-latest)	1m 55s
checks / test (3.11, highest, ubuntu-latest)	42s
checks / test (3.11, highest, windows-latest)	2m 3s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, windows-latest)	2m 52s
checks / test (3.12, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, ubuntu-latest)	47s
checks / test (3.13, highest, ubuntu-latest)	54s
checks / test (3.12, highest, windows-latest)	2m 54s
checks / test (3.12, highest, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, windows-latest)	2m 23s
checks / test (3.13, highest, windows-latest)	2m 4s
	24m 55s

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