feature: add abort controller

[jacobparis]

This PR adds support for an abort controller to the base Prompts class

This allows folks to programmatically cancel prompts after they've started, like with a timeout

const shouldContinue = await confirm({
  message: 'This message will self destruct in 5 seconds',
  signal: AbortSignal.timeout(3000),
});

or maybe you have a long automated process to get an answer but the user can cut in with their answer at any time, and, once one answer is picked we should cancel the other process

const abortController = new AbortController()

const projectType = await Promise.race([
  detectSystemSettings({
    signal: abortController.signal
  }),
  select({
    message: 'Pick a project type.',
    options: [
      { value: 'ts', label: 'TypeScript' },
      { value: 'js', label: 'JavaScript' },
      { value: 'coffee', label: 'CoffeeScript', hint: 'oh no'},
    ],
     signal: abortController.signal,
  });
  
abortController.abort()

Lots of opportunity here, abort controllers are amazing

[changeset-bot]

🦋 Changeset detected

Latest commit: 8214d75

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@clack/core	Minor
@clack/prompts	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR