Implement zip encoder and decoder between sidecar and backend to maximize the throughput

[stevehu]

Use light-4j encoder-decoder module to reduce the size of the request in order to maximize the throughput.

https://github.com/networknt/light-4j/tree/master/encode-decode

When both ends are implemented with light-4j, we shouldn't have any issue getting it implemented. However, if the backend is implemented with other languages or frameworks, make sure they support the zip encoder and decoder.