feat(custom-resources): state machine provider

[jogold]

Add a state machine custom resource provider.

It uses the nested workflow pattern where the "user" state machine is started
as a task in the provider state machine. This allows to set a timeout for the
custom resource.

This could be used as a base for a Fargate task custom resource provider.

Closes #6505

TODO:

• README
• Unit tests

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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[jogold]

Combined with tasks.EvaluateExpression it can be really powerful, here is how you can do the CfnJson from core:

const stateMachine = new sfn.StateMachine(stack, 'SM', {
  definition: new sfn.Task(stack, 'JSON', {
    task: new tasks.EvaluateExpression({
      expression: 'JSON.parse($.ResourceProperties.Value)',
    }),
    resultPath: '$.Data',
  }),
});

new cdk.CustomResource(stack, 'CR', {
  serviceToken: new cr.StateMachineProvider(stack, 'SMP', { stateMachine }).serviceToken,
  properties: {
    Value: JSON.stringify({ key1: 'value1', key2: 'value2' }),
  },
});

A good "LOC to deployed infra" ratio 😄

[eladb]

Combined with tasks.EvaluateExpression it can be really powerful, here is how you can do the CfnJson from core:

const stateMachine = new sfn.StateMachine(stack, 'SM', {

  definition: new sfn.Task(stack, 'JSON', {

    task: new tasks.EvaluateExpression({

      expression: 'JSON.parse($.ResourceProperties.Value)',

    }),

    resultPath: '$.Data',

  }),

});



new cdk.CustomResource(stack, 'CR', {

  serviceToken: new cr.StateMachineProvider(stack, 'SMP', { stateMachine }).serviceToken,

  properties: {

    Value: JSON.stringify({ key1: 'value1', key2: 'value2' }),

  },

});

A good "LOC to deployed infra" ratio 😄

Wow very powerful.

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[eladb]

I am closing this for now.