Create SAM StateMachine without providing a role or policy

[ConnorRobertson]

Issue #, if available

Description of changes

Allows a SAM StateMachine to be created without a policy or role by generating a role when no role or policy is given.

Description of how you validated changes

Added a test that uses Connectors without giving the SAM StateMachine a policy and changed the no policy given to test to see if a Role exists.

Checklist

• Adheres to the development guidelines
• Add/update unit tests using:
  • Correct values
  • Bad/wrong values (None, empty, wrong type, length, etc.)
  • Intrinsic Functions
• Add/update integration tests
• Update documentation
• Verify transformed template deploys and application functions as expected
• Do these changes include any template validations?
  • Did the newly validated properties support intrinsics prior to adding the validations? (If unsure, please review Intrinsic Functions before proceeding).
    • Does the pull request ensure that intrinsics remain functional with the new validations?

Examples?

Please reach out in the comments, if you want to add an example. Examples will be
added to sam init through https://github.com/awslabs/aws-sam-cli-app-templates/

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

[aahung]

generally look good to me! Thanks! Can we add a transform test so that we can take a look on what is generated?

[GavinZZ]

LGTM. Thanks for addressing the comments!