RESP endpoint already has back pressure built in.

It only allows a single request per client to be operated at once. This is done at https://github.com/infinispan/infinispan/blob/main/server/resp/src/main/java/org/infinispan/server/resp/BaseRespDecoder.java#L137

It also delays client operations if the client is not keeping up with reads. https://github.com/infinispan/infinispan/blob/main/server/resp/src/main/java/org/infinispan/server/resp/BaseRespDecoder.java#L125

The problem is neither of these work properly due to how ByteToMessageDecoder works in netty. If you disable auto read and do not add a value to the out buffer, it will keep reading. We need to change the decoder to actually publish a value to the out collection.