Allow gateway_timeout in InteractiveBrokers ClientConfig

[rsmb7z]

Hi,
I was working with TWS worksation on remote host and found the connection was failing. Upon some debug I found that timeout is set to 1 in interactive_brokers.factories.py with code line client.connect(host=host, port=port, timeout=1, clientId=client_id).
One second is very low. I have to set it to 6 seconds to make it work. It will be great if gateway_config can be added in InteractiveBrokersDataClientConfig and InteractiveBrokersExecClientConfig as optional parameter.
Please note i see there is default timeout set to 300 in get_cached_ib_client which is the total wait timeout before application closes. This has to remain as is, maybe just renamed. Thanks.