Register client info

[viktoriya-kutsarova]

This PR implements client library identification on Redis servers using the CLIENT SETINFO command. When connections are established, the connector now automatically registers itself with Redis, allowing server administrators to identify and monitor Spark-Redis client connections.

Key Changes

• Added RedisClientLibraryInfo object to encapsulate library name ("sparkr") and version information extracted from the package manifest
• Integrated ClientSetInfoConfig into ConnectionPool to automatically send client info on connection establishment
• Added comprehensive test suite (ConnectionPoolTest) to verify client info registration, connection pooling behavior, and authentication scenarios
• Client info format: lib-name=jedis(sparkr_vXXX) (version extracted from JAR manifest or "unknown" in development)