redis的用户名配置适配username

com.alicp.jetcache.autoconfigure.RedisAutoConfiguration$RedisAutoInit parsePool
String user = ct.getProperty("user", (String) null);
未配置user的话尝试用username获取

因为spring.data.redis.username 使用的是username，会导致用户理所当然的以为用户名配置也是username

Start at com.alicp.jetcache.autoconfigure.RedisAutoConfiguration$RedisAutoInit.parsePool and inspect how the Redis user property is read. Verify the existing user setting remains supported and that the Spring-style username setting is used when user is absent; confirm the configuration behavior with the relevant tests or project test suite.

Written by the indexing model from the issue text.