Add SSE polling support (SEP-1699) #3641

Job	Run time
checks / pre-commit	20s
checks / readme-snippets	12s
checks / test (3.10, lowest-direct, windows-latest)	2m 3s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.10, lowest-direct, ubuntu-latest)	41s
checks / test (3.10, highest, windows-latest)	2m 11s
checks / test (3.10, highest, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 21s
checks / test (3.12, highest, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, highest, ubuntu-latest)	43s
checks / test (3.13, lowest-direct, windows-latest)	2m 15s
checks / test (3.11, highest, windows-latest)	2m 7s
checks / test (3.13, highest, windows-latest)	2m 6s
checks / test (3.11, highest, ubuntu-latest)	41s
checks / test (3.12, lowest-direct, windows-latest)	2m 54s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, highest, windows-latest)	3m 8s
	25m 27s

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