Add SSE polling support (SEP-1699) #3557

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	22s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, lowest-direct, windows-latest)	2m 2s
checks / test (3.10, highest, windows-latest)	2m 1s
checks / test (3.10, highest, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, windows-latest)	2m 30s
checks / test (3.11, highest, ubuntu-latest)	43s
checks / test (3.12, highest, windows-latest)	2m 51s
checks / test (3.11, highest, windows-latest)	2m 2s
checks / test (3.12, highest, ubuntu-latest)	50s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.13, highest, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, windows-latest)	3m 19s
checks / test (3.13, highest, windows-latest)	2m 9s
checks / test (3.12, lowest-direct, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, ubuntu-latest)	47s
checks / test (3.13, lowest-direct, windows-latest)	2m 24s
	26m 8s

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