Add SSE polling support (SEP-1699) #3571

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	35s
checks / test (3.10, lowest-direct, windows-latest)	1m 57s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.10, highest, ubuntu-latest)	1m 12s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 8s
checks / test (3.10, highest, windows-latest)	2m 2s
checks / test (3.11, highest, ubuntu-latest)	54s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.12, lowest-direct, ubuntu-latest)	47s
checks / test (3.11, highest, windows-latest)	2m 6s
checks / test (3.12, lowest-direct, windows-latest)	2m 43s
checks / test (3.13, lowest-direct, windows-latest)	2m 4s
checks / test (3.13, highest, ubuntu-latest)	42s
checks / test (3.12, highest, ubuntu-latest)	47s
checks / test (3.13, highest, windows-latest)	2m 7s
checks / test (3.12, highest, windows-latest)	2m 58s
	25m 25s

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