1h default idle timeout (#23)

## 📝 Summary

<!--- A general summary of your changes -->

## ⛱ Motivation and Context

<!--- Why is this change required? What problem does it solve? -->

## 📚 References

<!-- Any interesting external links to documentation, articles, tweets
which add value to the PR -->

---

## ✅ I have run these commands

* [ ] `make lint`
* [ ] `make test`
* [ ] `go mod tidy`

Co-authored-by: Vitalii Drohan <[email protected]>

Author: dvush

proxy/receiver_servers.go

@@ -10,6 +10,7 @@ import (
 var (
 	HTTPDefaultReadTimeout  = 60 * time.Second
 	HTTPDefaultWriteTimeout = 30 * time.Second
+	HTTPDefaultIdleTimeout  = 1 * time.Hour
 )
 
 type ReceiverProxyServers struct {
@@ -26,19 +27,22 @@ func StartReceiverServers(proxy *ReceiverProxy, publicListenAddress, localListen
 		TLSConfig:    proxy.TLSConfig(),
 		ReadTimeout:  HTTPDefaultReadTimeout,
 		WriteTimeout: HTTPDefaultWriteTimeout,
+		IdleTimeout:  HTTPDefaultIdleTimeout,
 	}
 	localServer := &http.Server{
 		Addr:         localListenAddress,
 		Handler:      proxy.LocalHandler,
 		TLSConfig:    proxy.TLSConfig(),
 		ReadTimeout:  HTTPDefaultReadTimeout,
 		WriteTimeout: HTTPDefaultWriteTimeout,
+		IdleTimeout:  HTTPDefaultIdleTimeout,
 	}
 	certServer := &http.Server{
 		Addr:         certListenAddress,
 		Handler:      proxy.CertHandler,
 		ReadTimeout:  HTTPDefaultReadTimeout,
 		WriteTimeout: HTTPDefaultWriteTimeout,
+		IdleTimeout:  HTTPDefaultIdleTimeout,
 	}
 
 	errCh := make(chan error)