RESOURCE-228 lazy load kms key

[sathish-progress]

Description

refactor and setup lazy loading of each attribute

Issues Resolved

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
• [X] All Integration Tests pass
• [X] All Unit Tests pass
• [X] rake lint passes
• [X] 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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