XD-695 Remove NoOpRedisSerializer

- Switch to using RedisTemplate with null value serializer

- Move all conversion logic from Queue Inbound/Outbound
adapters and PublishingMessageHandler to RedisSerializer
impls. Allows greater flexibility in Message conversion.

- Queue Inbound/Outbound now allow payloads of any type,
not just String and byte[]

- RedisPublishingMessageHandler now sends messages
of any type, not just String and byte[]