feat: add support for abort controller

[bjoerge]

Status: Approved, waiting for #86 to land before merging

This adds support for passing an AbortSignal to all the request methods exposed by the client. It will also work for the APIs that returns an observable as well. Although less useful since observables natively supports cancellation, I can't see the problem in having support for it, but would love to hear your thoughts.

Note: I've copied the approach ky uses when it comes to creating an AbortError that works in Node < v18

Example usage:

const abortController = new AbortController()
const request = client.fetch('*', {}, {signal: abortController.signal})

// this will abort the request and reject the `request` promise with an AbortError
abortController.abort()

[stipsan]

Let's do it let's go 🚀 would love it if you add an example for it in the readme with how you use it in an await fetch 🧘

[bjoerge]

would love it if you add an example for it in the readme with how you use it in an await fetch 🧘

Great call! Added a couple of examples in 562b38b

[rexxars]

This is great! Thanks @bjoerge !

[github-actions]

🎉 This PR is included in version 5.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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