Support URL based connection to Redis through Sentinel discovery service

[zumo64]

When using RedisVL from Langchain library the URL based connection is used and doesn't not allow specifying one sentinel nor a list of sentinel agents in the URL.

Getting this error when passing this URL (as documented in the langchain Redis integration documentation)

URL="redis+sentinel://:redis@locahost:8001/mydb/0"
ValueError: Redis URL must specify one of the following schemes (redis://, rediss://, unix://)

We need full support for sentinel discovery service through RedisVL ..