Make initial read timeout configurable

api/src/main/java/com/velocitypowered/api/proxy/config/ProxyConfig.java

@@ -150,4 +150,12 @@ public interface ProxyConfig {
    * @return read timeout (in milliseconds)
    */
   int getReadTimeout();
+
+
+  /**
+   * Get how long this proxy will wait until performing an initial read timeout.
+   *
+   * @return read timeout (in milliseconds)
+   */
+  int getInitialReadTimeout();
 }