Improvements to the Redis connection/codec layer

[tishun]

Feature Request

This is a container issue to host all requests for improvements to the way Lettuce handles connections.

List of historical issues

• Investigate on ConnectionFactory #622
• Investigate on codec reconfiguration for a active connection #632
• Introduce MasterReplicaClient to reuse performance-intensive resources #1256
• Question/Feature Request: Transactions over keys with different codecs #2608
• RedisHashCommands aloing with its reactive/async/cluster counterparts should allow different types for keys and hash fields #2801

List of new issues