chore: add --from-stack to cdk migrate command

[TheRealAmazonKendra]

This change includes a refactor to migrate to align more closely with how the other cli commands are implemented.

--from-stack also allows users to set the account and region to get the stack template from.

Not included in this PR:

1. Integ tests - this PR has been manually tested and automated tests will be added in a subsequent PR.
2. Go support - there are still some bugs to work out with go (in cdk-from-cfn) so implementation for it will be added after that's been worked out.
3. The option to compress the app to a zip file

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

[aws-cdk-automation]

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[mergify]

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

➡️ PR build request submitted to test-main-pipeline ⬅️

A maintainer must now check the pipeline and add the pr-linter/cli-integ-tested label once the pipeline succeeds.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 11adad2
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).