feat(gatsby-source-strapi): Add timeout setting for data fetching

I've got a video file that is about 100MB hosted on my remote Strapi CMS server. It receives timeout before it manages to download the file.

Is it possible to adjust the timeout somehow?

Start by locating the gatsby-source-strapi plugin's data-fetching entry point and reviewing how requests to the remote Strapi CMS handle timeouts. Define how a configurable timeout should apply to large files such as the reported 100MB video, and verify that fetching completes with the setting enabled.

Written by the indexing model from the issue text.