[v5] Simplify `interpreter.send(...)` method

[davidkpiano]

This PR:

• Removes the 2nd payload? argument from interpreter.send(...)
• Only allows event objects (normal & SCXML) in interpreter.send(...)
• Refactors tests

-actor.send('SOME_EVENT')
+actor.send({ type: 'SOME_EVENT' })

-actor.send('EVENT', { some: 'payload' })
+actor.send({ type: 'EVENT', some: 'payload' })

Discord poll/discussion

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 03cb7ae0e37a5aaeee75267de82e03589b291ead

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

This PR includes changesets to release 4 packages

Name	Type
xstate	Major
@xstate/fsm	Major
@xstate/react	Major
@xstate/vue	Major

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Latest deployment of this branch, based on commit 03cb7ae0e37a5aaeee75267de82e03589b291ead:

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XState Example Template	Configuration
XState React Template	Configuration

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[Andarist]

@davidkpiano we only need to add more changesets here, but please don't merge this into v5/interpret-all-behaviors just yet - let's land that PR first and only then land this onto next