Allow passing request_timeout to client_fetch

[afbarbaro]

When using the jp_fetch function on pytest tests, the request timeout is hardcoded to 20 seconds. This change allows the users to pass a timeout as a method argument, still defaulting to 20 if it's not given.

I have some tests for endpoints that sometimes can take more than 20s and this change will make them pass.

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[afbarbaro]

@blink1073 sorry to ask something silly, I've not contributed to this project before, so I'm not sure what I need to do to get reviewers on it and go through the PR feedback cycle, approval, and eventually merge this.
Let me know what I need to do.
Thanks

[blink1073]

LGTM, thanks!

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[blink1073]

I'll make a release with this change tomorrow.

[afbarbaro]

I'll make a release with this change tomorrow.

Awesome! Thank you.