Multi deployer support for gRPC and raw TCP traffic

[rgrandl]

In the current implementation of the multi-deployer, we have an HTTP proxy that receives the requests handled by the listener. Whenever a request is received, it is forwarded by the HTTP proxy to one of the main backends.

However, if users send gRPC or raw TCP requests to the listener, the HTTP proxy will reject them due to malformed messages. We should enhance our multi deployer to make the proxy capable of handling not only HTTP traffic.

[wind-c]

Good!
Me really looking forward!

[wind-c]

@rgrandl , what is the progress so far?