fix(redis): support custom connection config

[ljluestc]

Support configurable Redis connection settings

Description

This PR introduces support for configuring MaxRetries, MinIdleConns, DB, and PoolSize in Redis connections via RedisConf.

Previously, these values were hardcoded:

• MaxRetries: 3
• MinIdleConns: 8

Changes

• core/stores/redis/conf.go: Added MaxRetries (default: 3), MinIdleConns (default: 8), DB (default: 0), and PoolSize (optional, defaults to dynamic calculation if 0) to the RedisConf struct.
• core/stores/redis/redis.go:
  • Updated Redis struct to hold these options.
  • Updated NewRedis and newRedis to accept and apply these options.
  • Added WithMaxRetries, WithMinIdleConns, WithDB, and WithPoolSize options.
• core/stores/redis/redisclientmanager.go: Updated getClient to initialize the go-redis client with the configured values.
• core/stores/redis/redisclustermanager.go: Updated getCluster to initialize the go-redis cluster client with the configured values.
• core/stores/redis/redisblockingnode.go: Updated CreateBlockingNode to respect MaxRetries (while keeping pool size min/max at 1 for blocking operations).

Verification / Test Plan

A new test case TestRedisOptions has been added to core/stores/redis/redis_test.go covering:

1. Default values (when config is empty/default).
2. Custom values (when config is provided).
3. Disabling retries (setting MaxRetries to -1).

To run the specific test:

go test -v ./core/stores/redis/ -run TestRedisOptions

To run all Redis tests:

go test -v ./core/stores/redis/...

Related Issue

Fixes #4668

How to Test

1. Unit Tests:
   Run the newly added unit tests to verify configuration propagation:

   go test -v core/stores/redis/redis_test.go -run TestRedisOptions

2. Manual Verification:
   You can verify the configuration by initializing a Redis client with custom values:

   conf := redis.RedisConf{
       Host:         "localhost:6379",
       Type:         redis.NodeType,
       MaxRetries:   5,
       MinIdleConns: 20,
       DB:           1,
       PoolSize:     50,
   }
   r := redis.MustNewRedis(conf)
   // Verify internally or via behavior (e.g. check connection count in redis-cli)