Allow developers to configure timeout

[tony-pizza]

Client version

Latest

Expected behaviour

Client allows the developer to conveniently set open_timeout for network calls, at least when configuring a client if not per call.

Actual behaviour

Client does not allow the developer to set open_timeout.

A recent SWU outage led our email sends to time out after the default Net::HTTP timeout of 60s (which for us resulted in a backup in our job queues). We would like to be able to configure this timeout to have more control to do what's best for our system.

Steps to reproduce

N/A