feat: add RedisEventStore for production SSE resumability #2267

Job	Run time
checks / pre-commit	30s
checks / readme-snippets	10s
checks / test (3.10, locked, windows-latest)	2m 35s
checks / test (3.10, lowest-direct, windows-latest)	3m 10s
checks / test (3.14, locked, ubuntu-latest)	2m 5s
checks / test (3.10, locked, ubuntu-latest)	58s
checks / test (3.10, lowest-direct, ubuntu-latest)	57s
checks / test (3.11, locked, ubuntu-latest)	57s
checks / test (3.13, lowest-direct, windows-latest)	2m 53s
checks / test (3.11, lowest-direct, windows-latest)	2m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	54s
checks / test (3.11, locked, windows-latest)	1m 56s
checks / test (3.11, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, locked, windows-latest)	2m 20s
checks / test (3.12, locked, windows-latest)	3m 13s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.14, locked, windows-latest)	3m 12s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.12, lowest-direct, windows-latest)	3m 37s
checks / test (3.13, locked, ubuntu-latest)	52s
checks / test (3.14, lowest-direct, windows-latest)	2m 28s
all-green	2s
	39m 17s

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