Add support for invoke source object

[davidkpiano]

This PR adds support for invoke source objects. This is not a breaking change; src: 'someString' will continue to work.

invoke: {
  src: {
    type: 'search',
    endpoint: 'google.com'
  },
  // ...
}

// ...

services: {
  search: (ctx, e, { src }) => {
    console.log(src);
    // => { type: 'search', endpoint: 'google.com' }
  }
}

// ...

TODO:

• Documentation
• Changeset

[changeset-bot]

🦋 Changeset is good to go

Latest commit: 01e3e2d

We got this.

This PR includes changesets to release 8 packages

Name	Type
@xstate/fsm	Minor
xstate	Minor
@xstate/react	Major
@xstate/vue	Major
@xstate/analytics	Major
@xstate/graph	Major
@xstate/immer	Major
@xstate/test	Major

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[davidkpiano]

@Andarist LGTY?

[Andarist]

a similar one is already available in packages/core/src/invokeUtils.ts - any reason for having both?

[davidkpiano]

That file doesn't exist, link?