Add Redis client self-identification for Apache Airflow

[vchomakov]

Add Redis client self-identification for Apache Airflow's Redis provider, allowing Redis servers to identify Airflow connections via the CLIENT INFO command.

This implementation follows the Redis documentation recommendation for client libraries (https://redis.io/docs/latest/commands/client-setinfo/) and uses a dual approach for compatibility:

• Uses DriverInfo class for redis-py 5.1.0+ to add "apache-airflow" as upstream driver
• Falls back to lib_name parameter for older redis-py versions

This makes it easier for Redis administrators to monitor and debug connections from Airflow.

Changes:

• Modified RedisHook.get_conn() to include driver identification
• Added tests to verify driver info is included correctly
• All tests pass, all linting checks pass

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[boring-cyborg]

Congratulations on your first Pull Request and welcome to the Apache Airflow community! If you have any issues or are unsure about any anything please check our Contributors' Guide (https://github.com/apache/airflow/blob/main/contributing-docs/README.rst)
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