Add a default timeout when fetching

[bobmonsour]

In building the 11ty Bundle website, I use eleventy-fetch to fetch the html of posts. If the site hosting the post is unreachable, the eleventy-build hangs at the point of the fetch. Feel like a bug.

I worked around it by making use of the fetchOption to add a 2 second custom timeout, like so:

fetchOptions: {
		signal: AbortSignal.timeout(2000)
	},

I'd have rather had a default timeout, but I'm not sure what the default timeout should be.