Enhancement: Add password and authentication fields to RedisChatMemoryProperties

[netbuffer]

Current RedisChatMemoryProperties lacks direct support for authentication fields such as password, username, or ssl. While these can be resolved via an external RedisConnectionFactory, providing inline configuration properties (matching spring.data.redis standards) inside spring.ai.chat.memory.redis would significantly improve developer experience and out-of-the-box autoconfiguration flexibility for secured Redis instances.

Please consider adding these fields to RedisChatMemoryProperties.

[utkugulgec]

I took a quick look at RedisChatMemoryAutoConfiguration — curious whether this actually needs new properties or if wiring it through spring.data.redis.* + a user-provided RedisConnectionFactory would already work. Would it be okay if I dig into this and share what I find before jumping to an implementation?