feat: support StateValue for transition parameters

[boneskull]

Bug Report Checklist

• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Overview

When using runUntilTransition(Actor, string, string), I should be able to use a StateValue instead of just a string. Per XState:

export interface StateValueMap {
  [key: string]: StateValue | undefined;
}

/**
 * The string or object representing the state value relative to the parent
 * state node.
 *
 * @remarks
 * - For a child atomic state node, this is a string, e.g., `"pending"`.
 * - For complex state nodes, this is an object, e.g., `{ success:
 *   "someChildState" }`.
 */
export type StateValue = string | StateValueMap;

So while StateValueFrom<Actor['logic']> can be used to handle the above, but it appears we'd need to "flatten" that type to allow them to be specified as a "keypath"; e.g., pending | success.someChildState.

And finally the leading id in the state keypath should be optional; right now it is required as that's what's stored as the keys of the private/internal idMap. Note that the keys of idMap are only string values.