feat: add imported amplify table strategy

[AaronZyLee]

Description of changes

CDK / CloudFormation Parameters Changed

Issue #, if available

Description of how you validated changes

Checklist

• [ ] PR description included
• [ ] yarn test passes
• [ ] Tests are changed or added
• [ ] Relevant documentation is changed or added (and PR referenced)
• [ ] New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies
• [ ] Any CDK or CloudFormation parameter changes are called out explicitly

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

[alharris-at]

Hi @charlesfayal - Thank you for submitting. Marking this as a feature request, and we'll update this ticket as we consider updating the DX for Datastore in the future.