network: make request timeout configurable (#7696)

electrum/network.py

@@ -759,6 +759,8 @@ class Network(Logger, NetworkRetryManager[ServerAddr]):
         util.trigger_callback('network_updated')
 
     def get_network_timeout_seconds(self, request_type=NetworkTimeout.Generic) -> int:
+        if self.config.get('network_timeout', None):
+            return int(self.config.get('network_timeout'))
         if self.oneserver and not self.auto_connect:
             return request_type.MOST_RELAXED
         if self.proxy: