chore(spec2cdk): refactor code generation with LibraryBuilder abstraction #36081
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Reason for this change
The current spec2cdk code generator (AstBuilder) is tightly coupled to aws-cdk-lib's specific structure, making it difficult to generate code for other targets like preview packages. We need a more flexible architecture that can support different library structures while maintaining the existing aws-cdk-lib generation.
Description of changes
This PR refactors the code generation architecture to separate concerns between generic library building and aws-cdk-lib-specific implementation:
Why LibraryBuilder base class?
Why ServiceSubmodule abstraction?
Key changes:
Describe any new or updated permissions being added
None.
Description of how you validated changes
Checklist
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license