feat: add RedisEventStore for production SSE resumability #2255

Job	Run time
checks / pre-commit	29s
checks / readme-snippets	9s
checks / test (3.11, lowest-direct, windows-latest)	2m 51s
checks / test (3.11, locked, ubuntu-latest)	53s
checks / test (3.13, locked, ubuntu-latest)	53s
checks / test (3.14, lowest-direct, windows-latest)	2m 14s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.12, locked, ubuntu-latest)	1m 0s
checks / test (3.11, locked, windows-latest)	2m 31s
checks / test (3.10, lowest-direct, windows-latest)	2m 26s
checks / test (3.12, lowest-direct, windows-latest)	3m 45s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.14, locked, windows-latest)	3m 25s
checks / test (3.12, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, ubuntu-latest)	43s
checks / test (3.13, lowest-direct, windows-latest)	2m 44s
checks / test (3.14, locked, ubuntu-latest)	2m 26s
checks / test (3.10, locked, windows-latest)	2m 26s
checks / test (3.12, locked, windows-latest)	3m 18s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.13, locked, windows-latest)	2m 46s
all-green	4s
	39m 24s

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