[SGP-24215] Pass a timeout argument to requests calls

[justin-thurman]

Some of our Marketo API calls hang for 30+ minutes, blocking an entire Celery queue while they do so. By default, the requests library does not implement any timeout. You have to pass a timeout argument to requests calls (see docs). Unfortunately, the marketo library doesn't provide any method of passing arguments down to individual requests calls, so we need to implement that ourselves.

Usage is as follows:

client = MarketoClient(..., requests_timeout=<int>)

The requests_timeout parameter must be an integer. It will be passed to all requests.<method> calls used in the library. Defaults to None, i.e., no timeout.

[ChrisAikman]

Awesome, thank you!