Support Redis key pushdown in Redis connector

[polaris6]

Redis is a key-value database that utilizes the concept of key and value to store data, we can use methods such as GET key to fetch value. when querying Redis data through Trino, the following sql is used in many cases:

select * from redis.schema.table where redis_key = 'key_data' limit 100;

This sql should return the record instantly, however it is not, it will take a long time to get the record. The reason is that Trino uses SCAN first, it will keep scanning data until the specified key is scanned, It takes a lot of time.

I see that stack users have also raised this problem, so I plan to do some optimization.
https://app.slack.com/client/TFKPX15NC/CGB0QHWSW/thread/CGB0QHWSW-1639826990.317500