chore(toolkit): cloud assemblies

[mrgrain]

Description of changes

Adds support for creating cloud assemblies from the 3 main sources:

• A builder function
• A CDK app dir
• A cdk.out dir

Describe any new or updated permissions being added

n/a

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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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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[kaizencc]

😬

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[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ CLI code has changed. A maintainer must run the code through the testing pipeline (git fetch origin pull/32947/head && git push -f origin FETCH_HEAD:test-main-pipeline), then add the 'pr-linter/cli-integ-tested' label when the pipeline succeeds.

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