[core] Add AnyState and AnyStateMachine

[davidkpiano]

This PR:

• Adds AnyState to represent State<any, any, ...>
• Adds AnyStateMachine to represent StateMachine<any, any, ...>
• Cleans up internal types using the above two types

[changeset-bot]

🦋 Changeset detected

Latest commit: 70e2080

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

This PR includes changesets to release 1 package

Name	Type
xstate	Patch

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Sandbox	Source
XState Example Template	Configuration
XState React Template	Configuration