Implement log proxy handler

**What**
- Implement log handler method that will hijack the connection and clear
timeouts to allow long lived streams
- Proxies requests to the logs provider and returns the response
unmodified

Signed-off-by: Lucas Roesler <roesler.lucas@gmail.com>

gateway/handlers/forwarding_proxy.go

@@ -155,6 +155,10 @@ func copyHeaders(destination http.Header, source *http.Header) {
 		copy(vClone, v)
 		(destination)[k] = vClone
 	}
+
+	for _, h := range hopHeaders {
+		destination.Del(h)
+	}
 }
 
 func deleteHeaders(target *http.Header, exclude *[]string) {