Add SSE polling support (SEP-1699) #3764

Job	Run time
checks / pre-commit	29s
checks / readme-snippets	14s
checks / test (3.11, lowest-direct, ubuntu-latest)	41s
checks / test (3.13, lowest-direct, windows-latest)	2m 28s
checks / test (3.11, highest, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 23s
checks / test (3.11, highest, windows-latest)	3m 12s
checks / test (3.12, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, highest, ubuntu-latest)	47s
checks / test (3.10, lowest-direct, windows-latest)	2m 4s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, highest, windows-latest)	2m 23s
checks / test (3.10, highest, windows-latest)	2m 19s
checks / test (3.10, highest, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, windows-latest)	3m 10s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.12, highest, windows-latest)	2m 59s
checks / test (3.13, highest, ubuntu-latest)	46s
	27m 38s

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