Improve example templates

[davidkpiano]

This PR improves the templates to use a new timeMachine that fetches the current time and assigns it to context:

const timeMachine = createMachine(
  {
    id: 'time',
    initial: 'idle',
    context: {
      time: undefined
    },
    states: {
      idle: {
        on: {
          fetch: 'pending'
        }
      },
      pending: {
        invoke: {
          src: 'fetchTime',
          onDone: {
            actions: assign({
              time: (_, event) => event.data
            })
          }
        },
        on: {
          cancel: 'idle'
        }
      },
      success: {
        on: {
          refetch: 'pending'
        }
      }
    }
  },
  {
    services: {
      fetchTime: () =>
        new Promise((res) => {
          setTimeout(() => {
            res(new Date().toLocaleTimeString());
          }, 1000);
        })
    }
  }
);

The goal of this new template is to provide a statechart example that isn't as contrived as the original toggle example, has more states and transitions, and also shows the usefulness of invoking states.

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Latest commit: 2ecf59494c8f08d1992961aa8fbcbc97eeaa1f77

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Sandbox	Source
XState Example Template	Configuration
XState React Template	Configuration