Soumyo/adding the missing attributes in SNS singular topic resource

[soumyo13]

Description

Adding the policy attribute in the singular resource of aws_sns_topic

Issues Resolved

List any existing issues this PR resolves, or any Discourse or StackOverflow discussion that's relevant

Check List

Please fill box or appropriate ([x]) or mark N/A.

• [ ] New functionality includes integration tests/controls
• [ ] New Terraform resources
• [ ] Documentation provided or updated for resources
• [ ] All Integration Tests pass
• [ ] All Unit Tests pass
• [ ] rake lint passes
• [ ] All commits have been signed-off for the Developer Certificate of Origin. See https://github.com/chef/chef/blob/master/CONTRIBUTING.md#developer-certification-of-origin-dco

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