feat: add RedisEventStore for production SSE resumability #2256

Job	Run time
checks / pre-commit	31s
checks / readme-snippets	13s
checks / test (3.12, locked, windows-latest)	3m 21s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.11, locked, ubuntu-latest)	55s
checks / test (3.14, locked, windows-latest)	3m 18s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.13, lowest-direct, windows-latest)	2m 37s
checks / test (3.14, lowest-direct, windows-latest)	2m 36s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.13, locked, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, ubuntu-latest)	40s
checks / test (3.10, locked, windows-latest)	2m 38s
checks / test (3.13, locked, windows-latest)	2m 53s
checks / test (3.10, lowest-direct, windows-latest)	2m 17s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.12, lowest-direct, windows-latest)	3m 22s
checks / test (3.11, locked, windows-latest)	2m 51s
checks / test (3.11, lowest-direct, windows-latest)	2m 55s
checks / test (3.12, lowest-direct, ubuntu-latest)	38s
checks / test (3.14, locked, ubuntu-latest)	2m 28s
all-green	5s
	39m 34s

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